Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c6f8a302636af0…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 18:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b86daf85120e7a1df011789a1e5539d SHA-1: a799c24154bd495b260b43218a2c0fcffbb82e5d SHA-256: a1c6f8a302636af034a52e4e83d0cadcd2441878fffd0bd13a96bb1299c45a9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087969a9d9c8---56368182728.pdf In PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1b0a2d5bb951cc257b32d5eede40e286/82032180249.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/m66kojc8f7j3o776j3m8fd85p1/10001698814.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073e7e08f9b6---lanemorapeguruwopizulaza.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/b6eeb1d8815f0c10e3871232c9b30447/77098165929.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/xofalusobibusevevonus.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/47825475661.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c76ce4563952c5b0da8a7a2c57d36c8d/49749797199.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae06c4842c---supowuluzigose.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acdd8bb09e5---sitexamuvirif.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/74981851362.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cd380106---wagusesewu.pdfIn PDF document text
    • http://matras-devison.com/upload/file/tuxuvereniduxovusudojoz.pdfIn PDF document text
    • https://whitesal.com/data/images/file/7572_20210721225033.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zefuz.pdfIn PDF document text
    • https://www.roadsafetyrental.com.au/application/third_party/ckfinder/userfiles/files/denovuxuloxafidimavirejod.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/78388512382.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210623_F63EC5CE46A69636.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/75810114537.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd614f12f9---runatarodaman.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-13/20210613060022627952.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a8c300de262fe5225b67eafacc2c5c0e/kisepuguweduwamodij.pdfIn PDF document text
    • http://yilip.net/userData/board/file/70346372199.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609238353ad36---jijunubivawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=scrum+master+certified+practice+examPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 17592 bytes
SHA-256: fce72ba1b1a0df302441ce75a83c248cc90c604428e8599a3d12648480742f43
font_01_sfnt_off00011cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFC 10788 bytes
SHA-256: 403ed68cb86bb50b4eab9a6e31b2fdf85a4bf2f00e78ac9d4a7061544876b9ac
font_02_sfnt_off000135e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1