Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f35d7a8dd931952…

MALICIOUS

PDF

90.1 KB Created: 2021-07-20 13:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a091605b769436727c4b33558515050 SHA-1: 0c746966bec1d029cdd5f4e7f091c5f14a45bcee SHA-256: 7f35d7a8dd9319529d684eff3eae0e5800b387b6292ef0433aa987ef8bcdc0f1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document's structure and embedded links are consistent with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9096qcebfffgu9g8psln63rijh/66205467935.pdf In PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37dacb51c4---warezapijevumuxo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be44fe61bca---84605765592.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f0372e89bc4b915f1017e2c00e0b2570/89934884864.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160848f85d31cf---98568366330.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed894bcf20e---64379493520.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/23f1c79d32a998522143a9462cc84806/malinexumorepidafu.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/50191556892.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xububapozawulafoposozifo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a932dd3faf8---bepiwigolusu.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a052cb2b024---29390588808.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/tixaxugozuzelosuziso.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/wigawom.pdfIn PDF document text
    • http://jump360.co/upload/files/20210610044613.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/6606a951a0ccec57387af2ae8a2f548d/jixitulinumaxabapisugono.pdfIn PDF document text
    • http://dejede.com/userfiles/file/210666019.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090833fa137c---39764980047.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0a0d26305f5dc958e89ec11d61357cb6/mupixitupasej.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/51542502225.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5b76dd70b---98520973611.pdfIn PDF document text
    • http://btfa.tw/upload/files/94207008478.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zizewi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2c4d1ee668a7f5fa7715c584c7017fe3/12400324842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=1+year+old+tantrums+hitting+headPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739428a5caa---66501633815.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_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10864 bytes
SHA-256: e6567d13701aa9d64f0b9fa671deadb92bf57a4a82efff2e68437569c5b9c0bb
font_01_sfnt_off0001166f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166F 17184 bytes
SHA-256: 4cdcb0e48558ad524b48f7afe36e2410d818ed942890b2d024fd0498258da982
font_02_sfnt_off00014315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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