Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acc9afcb6b4b45c…

MALICIOUS

PDF

115.9 KB Created: 2021-08-19 14:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b7a685739df38ffe960f68ae69edcaf8 SHA-1: 3e48fa7266b3cf5cca334ebe87d7d797a5b01315 SHA-256: 6acc9afcb6b4b45c0a4dcdbe2841bf895aead9a7838556ecf7f45f3a41f6383e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/796204629bddf9b7c79c051ba4a1650b/27322634176.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284f37cd58---24292365294.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1559c471---zudamutosotuzi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076aed425bf7---85018270572.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770c14c952b---rasabu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/spaush1funuiise38q2tqrm8ie/tilokizu.pdfIn PDF document text
    • http://bio86.fr/fichiers/somedilimobevefutum.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7a2760492---lezebejurejaxidi.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/merisajefabazojuvizaj.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/f188f5421e2fce8c90da7ee6f334d8eb/wineruzuzobunuvekexale.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b05b467848---34540457759.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/88679805355.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/55882758743.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/45rrjvc48glgnjjjhs8r6bgb10/nisasoxuxejezupozod.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/pulodimef.pdfIn PDF document text
    • http://sukhabalka.com/files/file/jimosebewawasarapobu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1688ab5982913a0fe3d0edd9ad5191e7/66218075138.pdfIn PDF document text
    • http://firegallery.ru/img/upload/14960457984.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/duripuvixa.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/f9vvtq1n6k9ekto5tt4c4c7nff/wudamuluj.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/1473020241.pdfIn PDF document text
    • http://gkia.org/kingkong/userfiles/files/jotuxirenafoluzisamit.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/45701788875.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/56978646394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=notice+d%27utilisation+chaudiere+de+dietrich+mcr+24%2F28+miPDF 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_off00015d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D44 18868 bytes
SHA-256: e5fe8bf034277f4eaa509f36132c48244c8e2d048c73016c1fc0b44a02ce6ca4
font_01_sfnt_off00018c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C99 11188 bytes
SHA-256: 37ab1feec99ebb8e771af91554702b0e758f38c06b9c83951c74c72cee6c463e
font_02_sfnt_off0001a6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1