Malicious PDF — malware analysis report

Static analysis result for SHA-256 855b7426173961ac…

MALICIOUS

PDF

84.1 KB Created: 2021-08-13 10:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72e32d2228987db7e4a4ec59808918a8 SHA-1: 763739d51aecc217003926ed44f9fa3a40ae418d SHA-256: 855b7426173961ac0f21d703582f4518b0e224678f6dd6723f7db3438381948b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download' button lure further supports a malicious intent to trick users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854bafb9910---lomakulowek.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcda135527---nunesepupasakitipu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/leganelo.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b078e62bf78---88656597018.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/mewaxalozasuzu.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/lepiton.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/33592485737.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc3b6e73d---napibe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0bb511865d51af821c83049b0e391e9b/13271114358.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/jexevesatakufinuruke.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1199f2f74e---7851258691.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/36899749076.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c639303c6---kigirufinifiwifoxovina.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75666344974.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/44265623128.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fd9af4723e2b6117bef4741879411b18/32673574568.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/31095133586.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072681908949---82026223528.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/wufiwejaramidafuj.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/aj65crha7oso1mbrkrsffkgrp0/25075744851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=spider+man+deadpool+comics+free+downloadPDF 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_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 17692 bytes
SHA-256: 5dc4b679477956fc251d511e40f8e495834e94c00af451cf9abca4f3ed5b779d
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 10844 bytes
SHA-256: 8156b01579fd3b8e5facb1ec8eddb21e3ca749e824346cad2483a0b5e79b797f
font_02_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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