Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8f016406bbbfbb…

MALICIOUS

PDF

72.7 KB Created: 2021-06-20 09:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a715d4773613577eb6b6bd87187729f5 SHA-1: 21dd893f31e39411deaabd542fcef5b02bb2fe9c SHA-256: df8f016406bbbfbb5795b4ad15bc512e2f78632825b61bad39f13a7c486ace82
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://shop-ecobati.com/medias/upload/files/wutap.pdf In PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e2797b7cf180d64fb0989c88a3bfe523/nefolozupazunizazexike.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607029fb37a35---51360620862.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/8060653509.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6ec935bd5925d156931cd097dec29c0/84716745065.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/34648531180.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/nowizelonudofatomezipusiz.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4594f08f7---65169104320.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/enu18a3onl2t6u879ebegi9sru/rimikeja.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/6208060155.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/7331c2840588807c7a1189f6486fb934/lobigizilik.pdfIn PDF document text
    • https://anfauglir.com/images/file/tikojotirezin.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/43108284817.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4dc702b6f79e38e49037e716bf8357b8/pizuvudovedazokuni.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/25734349917.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6259cdb3ab---wuxewolabewopiwujoro.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jiguwojivifojiwejuku.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/ad95q99d42c80l7dn6unp2lte3/1272566408.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/97128703177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rm+drake+books+pdf+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDA 5488 bytes
SHA-256: 559c061cb666478f13323ff98aac04afe8769dc3466319633693b8276ec850f4
font_01_sfnt_off0000f27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10372 bytes
SHA-256: 2a5107d9cfe8e398790973866cd78a4ef30aa302f76890259256aecb91cf3427