Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff5e036217781b5…

MALICIOUS

PDF

92.2 KB Created: 2021-06-27 09:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d38f21c8b07896ac87c89647c00edaa8 SHA-1: 700a6a29d3005335a55f85583bb3a51698a08760 SHA-256: 6ff5e036217781b5890bf6110775ab8b7ff33c7a819c2c08ec55edf8d11daa8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=life+is+a+beautiful+gift+of+god PDF link annotation
    • https://investmentskillsgroup.com/images/userfiles/file/48665126212.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c9879687a62447d2b14666d0338fc202/luwikesomunulelunaxafuwe.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/91838402417.pdfIn PDF document text
    • http://boyanbolyarski.com/userfiles/file/46591965954.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gowowuvikotuv.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05faae7d59---1308701111.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/5527417c2464933d6b5f72c47eb8d72a/76088229938.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce95e16a5---bemowu.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1a05c4cc54f513efc0a665db3f935c0d/97290034273.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/fajeso.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fe718defdb242bda7a487434e44cf303/fewotefaxomofemotena.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ak6s6q6msfhvt5l1iccneunfa6/sefonokidupowijafa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/cbspeefte6b0okr34mf34p4i78/zumuxawa.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5fd8cee9e99173ac42be7bc4b6a9218d/19160293487.pdfIn PDF document text
    • https://ancoraeducacion.com/images/14026469768.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/cd073cfd337bae6661af248aeeecbc4c/2798215014.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/48709432797.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/58143867052.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1bbfae06fd3ee718b77e24b61d1099fc/kalib.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/naxosenitewid.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_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 10520 bytes
SHA-256: 28c05c3c057fcdfa151d51391da7d5871b1c98f4297141d1a4550fe8f1c9a221
font_01_sfnt_off00011d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D89 17672 bytes
SHA-256: c7ca68edc925cefc6ce0d0e90192759fa980d3ca8418f26d728a8604fd25b2b3
font_02_sfnt_off00014bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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