Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b8d6fd0f9a571f…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8ab9e57bc53368688a009d659201baf8 SHA-1: 519275b5202e03186bb3da84572f6111903b4f51 SHA-256: 03b8d6fd0f9a571f7d29a9218f88725696c19c3e7db8988026cf8e8396b80cbc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers, containing numerous links to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content, potentially for phishing or further malware delivery. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/f226b3f3420b32cc5bcebc7b53bda2e0/13038976214.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9faa7c17a8cccb743a15a4813a45e5ae/97951319259.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bee50903ef2dbc0c5609724fed3540b7/xapomowolivulopowufobuvi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/muriribuzexagono.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/e71ptto3vlgc9m9rck2npuaka0/xuwetajidawuzos.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8e82be338f---50862410029.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c2ca65e6e---50886011914.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c5b602c61b23855efe8abcd5e52c23eb/96014680036.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/l4f43m18b0edtkd2ke87krm872/90690970051.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8349f7b761---16762193680.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a568868824---65404313212.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c176f60c---saxupinosupitidunojekode.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895558b0996---jufetirabasopifat.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6a6774fa43be76f131f0b5df4bb46f21/38909272876.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c64ff58331---63129821764.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081480202c55---72956627299.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b82c52ab---lagagivirebidudanexen.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/49802222386.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/lupasetotakakaf.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/pojebivutadob.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mazokupope.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2e139ca9---ruxoniruxuzi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b09e04c4498---wagijekobeguf.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3839f2b0d---22044132364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lucy+and+lentilsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10316 bytes
SHA-256: c6090182c1e5b9e8e66f71f95fb45e38d4e2683143287943f6bce132a144f5df
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 17588 bytes
SHA-256: f3e0dafba46ed0e29dc4c1c15a73bb8c78445aeaf50b6f319c094c3cfd8e2d47
font_02_sfnt_off00013ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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