Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfde2b292f13f262…

MALICIOUS

PDF

88.2 KB Created: 2021-07-02 23:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7a4f95443ac03d8396e8cf59e8077c9 SHA-1: ec592ec7c3f18bd7ee13ec31109942f500fffb1a SHA-256: bfde2b292f13f2620852cc738a81d1335f4d6106d251e10b1b08439fc51c3bcc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/buf6e8mtmc5vecneh5djccgnbu/8395227288.pdf In PDF document text
    • https://hkparkkonutlari.com/image/files/563921476.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8ee8b07---23453754425.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/tebofutojepavivalebif.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/xipanofogopozemez.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/26472ef5b938960330c5ff71d73a3d51/80307741224.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0be969e6---3637158916.pdfIn PDF document text
    • https://cubic.is/userfiles/file/dofusumu.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/rofol.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f691ab8e69d2531e4b831062bbc4746c/76071188586.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678e7f1bf2---vivan.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/bexuton.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/64ec2d5805ad944cbf78cacea56cb3ca/bibugezanozi.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/4talh3lvjks8kh7983nr90p902/bedolexopedej.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c09470ad6e7---zavotawijixefuf.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/86349540283.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6mv4r96lru3tvaj8ond8tjp2ej/40688972043.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608685b4af660---40000580472.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e778794e5524c937888793b5481f5152/60497029883.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jitibakuviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=side+effects+of+getting+tubes+tiedPDF 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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 10656 bytes
SHA-256: ab0f97898047bf0bd0ac73dd5f3ce02e4d6072d3441ace04be6f7f4352a1b465
font_01_sfnt_off00010e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269D 17280 bytes
SHA-256: afb3ae203382aaa5176207bcb7245957c0748542742017733695054a86c9edf2

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