Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46f361cea1b5eb7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-22 14:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: da3fb693d3e1371606378ec782e91978 SHA-1: e5a867b904fec5bf9e4a6f5df4c405ae404c79f5 SHA-256: e46f361cea1b5eb7dc4111ec7bbcc40ead1a690676727147aab19786563ccad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=android+speech+to+text+punctuation PDF link annotation
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/62010357455.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a41240046c64c727c3918e635a4ee898/musuwi.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/xorexobamifunapedinewobid.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/58e3b82fb6e2f63e06befb44b13c9c5e/38564672666.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/gazufixex.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/54150835540.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nafaxuvifiluzoga.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/zetabatodevudevexirala.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/vuduta.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135079490ca2---mulewunawagufulasigokoli.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/wodarupamebanutivabi.pdfIn PDF document text
    • http://hkwwta.org/userfiles/64519135349.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133614e5fe68---297159926.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/muzolulokokapojufedikuje.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/dojaxuju.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/ruvebamiru.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/pomurivifefekirerufu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/kisor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/j3f127l4kvu7hd33e8f9dig0qc/tusepakitekukoza.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/51984800515.pdfIn PDF document text
    • http://headrepublic.pl/images/files/25648489632.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/warijizo.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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10748 bytes
SHA-256: e292e8dbf42c0854d1780f7caea35b03f6ece4214597da4d12c651e6afec712a
font_01_sfnt_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 17404 bytes
SHA-256: 6d379e46b98592831f03ddf14f01ae871db036022bd2d596d2c65bd7e7657e2d

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