Malicious PDF — malware analysis report

Static analysis result for SHA-256 c918003a041bdae1…

MALICIOUS

PDF

98.3 KB Created: 2021-09-19 16:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 001796e92bf67eb1ae8494b7e2e47518 SHA-1: 2a2a7efa5ebea4b04bd78a74fcf73dafb5ca83df SHA-256: c918003a041bdae1fe38347e35678bc5603f56f2578e5a80b05248d21f17bd74
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests the document's primary purpose is to facilitate the download of a second-stage payload from these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://oniceh.ru/uplcv?utm_term=movierulz+2020+all+movies+download PDF link annotation
    • http://tjsyjdq.com/v15/Upload/file/2021914134786671.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/66641757587.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10371446533.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nosewigozali.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a8455c3d---57465762181.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/gezugemuvogu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/53561912228.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/juzisodigibiwozo.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/76700775935.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/koselilujuriwo.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/92210607330.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2j0b2pi914gs7smdh9nqu3vli7/mepisifopufeziketekuda.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lilisujaka.pdfIn PDF document text
    • https://shunnasato.com/kavururexajuvekiwuxe.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/22178523600.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/43634996598.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54749b19f---bepejapuj.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/93570566466.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pepiguvawexe.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/jasezunowamijujaj.pdfIn PDF document text
    • http://archbot.pl/files/file/59916118651.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/46610143517.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dad9bf28d---23449062974.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/bubogixumezuj.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210914_D0BE93A6D7E267BB.pdfIn PDF document text
    • https://ferropula.hr/files/digijaxoxokarevasi.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10856 bytes
SHA-256: a58b3f7ad9c55db70bf84fad20763b16ae502d36556c645e4f035c8d365ad4a0
font_01_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 17460 bytes
SHA-256: 803c5613c770118e8e2af0cd3c74a6eb4f8c6bb7f3a5c8e4bbed36712ec5379a
font_02_sfnt_off0001634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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