Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6307e8b4762df7…

MALICIOUS

PDF

89.7 KB Created: 2021-06-13 22:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0f8c3d68981ab1e554674577112aae7a SHA-1: 6eb7fe84e45abefb21b74d3d9d83454a4bea710b SHA-256: fa6307e8b4762df7b7707f8896bdc5247c29cde1227e4e12a86e3384452b987c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic firings indicate a link farm designed to redirect users, and the ML classifier strongly flagged it as malicious. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/uplcv?utm_term=subtitle+john+wick+chapter+3 PDF link annotation
    • http://argol-editions.fr/userfiles/file/78787905123.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098298aa9a63---35366887548.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/10/mopelufasuvufoxewaxinir.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2b6f9d15d08bd8e116eb74aefbacf0dd/devebuzagadoxo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607347305aeaf---siwesolepud.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ff032e202a0708b3f07ceceb8fbc44cb/11811943329.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160898017b2f96---58637560889.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/a966c1b2d4c56b3c599a05b7b578350a/11065743464.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/cbe353db1f3ab1a270b9ac7fe9d8192b/13226007338.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/54048f47915c130747e0e7d3929d548a/wekubepilegule.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/65496513465.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607170bc096c0---82811910773.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d7moa1lajlmm931n9rqj3hhi61/89245364122.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/b3f358c3e8c3fcff605fe7120ea509bf/40211642229.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ab0c586f5091ba89a803134ead06f5d0/86786945962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 5480 bytes
SHA-256: 0873c7f3963add439fc679ee36c2c1ae3ea9ed8ff4e74eaaab862e602f56de39
font_01_sfnt_off00011728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11728 13728 bytes
SHA-256: 091e50ef52e2461f3adadda33b8bbf76f2e996f0104a90bf7f689997dc50c3f4
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 7076 bytes
SHA-256: 28dbf4f21320c0e4e8d4bcea60880fe68346dec372e62c14d8086952a20140a8