Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484595da3ecd019…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 21:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1af441a582c9a8034c71d82aa5c7b8a5 SHA-1: fca910cfec3edc44b37ea4615bc7f5cd330591c1 SHA-256: 7484595da3ecd0192ce3752cfe70a042ba87942ef27a6d90ca461829988aef4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, with many links pointing to PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, likely to evade security filters. No scripts were extracted, but the presence of embedded URLs and the overall structure suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/p4ec0kadbtkfippuopc7hg1uic/deruvanopuporajubamoxuku.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6919593e---69874474757.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/javorirewepixivolefudut.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/go9fbmjkq60pv2l8p4354fjh4r/jasagulaloravukutetu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57216658608.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/muganokepawuwalosataw.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/feb05998b0fcaab74ac2d71f8a4d6c42/sokadesug.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/18636280676.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/81770733389.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59009e186---45271021905.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/eu8glqim4dqqmk0v54va1q7c75/golunamejubepopevolane.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/rejero.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfc793d9d---gopepomurepugaviba.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bkkcvudpgt16hd1vvu38dtd9mr/bavifipadobasawisa.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/37545963729.pdfIn PDF document text
    • https://forssh.com/userfiles/file/13406070329.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/qdcpo6577brp5bkk0oeg5moucj/88506896644.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/borajugu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/78b31562be7a663b9daa9112eaba59ea/vuroxelamuja.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/13230775536.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/76169009996.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/fatalunomabuxazodopo.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb0a3dffb---16911187365.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/94618822081.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/prqgq9vpaet57ivggb9ettmnlq/kikasuxetudiwusajizixiwun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=transferencia+de+calor+cengel+4+edicion+pdfPDF 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_off0000ce4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 10736 bytes
SHA-256: 7d9b0a7c265becaeebc03de6343d2e1f29e83ac16eb121e37cc0746bf5c5a0cc
font_02_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 19104 bytes
SHA-256: c752b94d341ff8a4d16056d7dd3602cfcafc84c3614f14a82f8a5c63dd9a2ced

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