Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50f38c34ed12873…

MALICIOUS

PDF

116.6 KB Created: 2021-07-04 20:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4484c0275b953af25779370664a9fb68 SHA-1: fd970e0056b1dd0be37a1ae032f64b0a769ae18e SHA-256: f50f38c34ed12873c2d5b504da6014c01fcd13b496275c5280d15b39c2fa112d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings align with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc50b3708f---pepuvufuxoforaxedola.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609851ad75d46---rajafalimafo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/mebinokewidixarejolepa.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb5b7c65d---63199960492.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/tonasotopisidabagere.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607354138df1e---1298724352.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/93f078ec1d9aeaed76df42036116f75e/wobowoxuzimisuz.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zawis.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/10773374647.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608000849d573---vuzus.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fd0c86ef---97286292732.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700c77f26cd---kufivojapawewu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8d754bf21---fujegebozajosep.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b620253287---mebegowelosapa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/771dqag1rf416nubuvntjhs5i7/ramonidodubawifazuvuguxem.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/48104787505.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4792bb097---muvebemubilup.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/kexin.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a041062dbb5---78998012702.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/37829495738.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8408929575---91878673243.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5993fdfa15c894d1993619db794fc2e/nipozemoxabivuvu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/51fe9d18f3cdbe45c8b4f02bf505a01a/daseliri.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/60132739561.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/maj0c8ucqgumrfk0tha4ih3t09/viluz.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/24503146057.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607aadac2d91b---80708844794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=go+up+the+roadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000173cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173CB 2580 bytes
SHA-256: 31b307e0bfdd928143a78db108c3792e9bac4e60c26c329be51e776929fdcfd4
font_02_sfnt_off00017eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EB9 10220 bytes
SHA-256: 77637ae8423599d8e24b6e3fbfaa10254fb4f3e16ac128cda9d67ae6d0ce7f02
font_03_sfnt_off000195c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195C9 18260 bytes
SHA-256: 6c41397abb5b3b66b4b094463732f88e0565cb6a512152d62a9498121f42e224

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