Malicious PDF — malware analysis report

Static analysis result for SHA-256 9833964c94a63332…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 22:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fba3257ea21b341d68bfac376bcdd9d SHA-1: a03853495f9279a09d20653d6422e6c871e3abaa SHA-256: 9833964c94a633323cde3b6aa1378eb929223df17001a3943e1751628f4d8e77
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gainliving.com/upload/editor/file/xodewovomefukujorutapenam.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/newapaxej.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/wesomesi.pdfIn PDF document text
    • https://magnumattachments.com/ckfinder/userfiles/Files/97255232052.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/detizapasejuvopi.pdfIn PDF document text
    • http://salespate.com/userfiles/file/zigesojexolu.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/kedewanuguzejirunusufewab.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gogitatobanokatepol.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ef035e254ab7f88c6be14ce2fd95234e/sopowalujamog.pdfIn PDF document text
    • http://skncn.com/u/files/35039962121.pdfIn PDF document text
    • http://shahgrp.com/uploads/fividivuxalexap.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/60458699144.pdfIn PDF document text
    • https://russiancosta.ru/ckfinder/userfiles/files/75609889277.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/jajufewevajelo.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/30246322604.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/c5205b4160a1ec28810fb2b09d32992b/57617058448.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479afb2d486---67321342480.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/20414752108.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/botulorofulenenijepupemi.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/40458419899.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/57314941799.pdfIn PDF document text
    • https://makenie.com/upload/files/puromo.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/27010993651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=turbo+followers+for+instagram+apk+modPDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 11220 bytes
SHA-256: e2874c31c4167e15fa5dc6cb12f263809cfd9d066f4861c43b597b1ad2c32928
font_01_sfnt_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 15536 bytes
SHA-256: 1c0ca101177ca4fbe1ce1ea7f8fdbc1cd11c42dd7eb5dea43b454e12ae4044b2
font_02_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1