Malicious PDF — malware analysis report

Static analysis result for SHA-256 92df5542b80352d7…

MALICIOUS

PDF

88.0 KB Created: 2021-08-23 11:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99125ba3eeb85cf2e7305d5ab7c21706 SHA-1: 6d24eaab40e097304449be89e97e1abc213b825a SHA-256: 92df5542b80352d7a262d05df43f1eab16a20d9bb1fab0195a2942c6d16dfcb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nomylo.ru/uplcv?utm_term=auld+acquaintance+be+forgot PDF link annotation
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f26547c0c64a49107a253305c55b8f5c/rakavosakikovok.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c53e29bdc---93611498981.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/ninubiwamesizuzemamevon.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/40347875995.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0limkvtomle2cttpqojhb5v5t0/juzepuronoxozotaxenuv.pdfIn PDF document text
    • https://festacontinua.it/public/file/dagowuzarif.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/6072831851.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/91933021421.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/pozesixoxeze.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/gufonigufukotugupase.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/62078815848.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/53979472037.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2935db96de---genoxupuwus.pdfIn PDF document text
    • https://xigmatek.com/upload/files/58720397487.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/42d156b9b72bb3ccbb6455f7d66dc420/87217343343.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb966c03905---mikejufo.pdfIn PDF document text
    • http://weingut-suppan.at/files/rozitatawibopupobe.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/vekixevatopajez.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09908e1cb2---fuvutifipafojofujave.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/mikivulitegiwerolowofu.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/99858057356.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/95708493898.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/bedufonadupotewod.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 17132 bytes
SHA-256: 5e624b3ecd9106dd0299e9b09c3c658a9a2292489649094896997006579cb1e1
font_02_sfnt_off000138bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BC 10852 bytes
SHA-256: 87607b55d3b5957e3d1d09cc7873f9a5e0e1b59b2074c9ee624bb51e31332caf