Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9444c3bb368012…

MALICIOUS

PDF

81.7 KB Created: 2021-06-19 00:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57ce1e4b789ca4a5795408030fdf79f6 SHA-1: 98282e2796251eb240514eadafefb141dc0b9de1 SHA-256: 0c9444c3bb368012120ce9efbf008462ec36a45e10e4b0062ba24abebb158cf9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a number for a fraudulent purpose. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it is designed to lead users to malicious content or engage them in a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/35f2d767e9d9149f7bc9f2febe1673b5/11081287254.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d792d282a8045145d2df39d7d57bea96/53807860791.pdf
    • http://ascensionchina.com/userfiles/file/kitibagol.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/37aee46f5ca4ddace247aa6fb4e827ed/zipibenazenojav.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3013e217---jazopejima.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/lufo8g27e7ktb3051q9q8u5nt4/vekewazarajotixevu.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0094191d---23349313829.pdf
    • http://colafranceschi.it/userfiles/files/88893309555.pdf
    • http://poltinik.ru/userfiles/file/89229129539.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d883f15ac3---muwaredofade.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/211fe42e572363f34a6779eea3231824/59501057454.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd09b1c2ee1---98535824272.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/24ea5e41dc2450cd43b0013ff59082df/titiruwibone.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fepuzurosejusilavolo.pdf
    • https://diarch.in/WYSIWYGImage/file/64941471021.pdf
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/fenazedoboritenunemazi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=accenta+g4+engineer+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010036.bin
d07882517bb9e5151cf7b3a51e6453cad17151046d875e4ed3a1cb126c8a2b05
pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 5016 bytes
font_01_sfnt_off0001113a.bin
f206a43efdae1577f493a223eae6acc3ffea686ffe9fc33d63812947b709402a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1113A 11900 bytes