Malicious PDF — malware analysis report

Static analysis result for SHA-256 63acb9f012cc993e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 12:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0fcd2783e2c84ee662b60030cf7ecfd SHA-1: 22830496e786b77774555368e20453e20bdffe91 SHA-256: 63acb9f012cc993efcf64ae00cd8487027d26401b9f1209ea4a11a92f885986b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm or redirection strategy. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0af949ad---7848411326.pdf In PDF document text
    • https://aradovan.com/userfiles/file/geminukugulik.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/sutokalodedefo.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/nokojutelitozetedu.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/95140581990.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/46541509036.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/uvpgcslmq29n791suqkn29lbrb/65314660801.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/juladelogilinatevinuxot.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/xovumajowejeva.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/11674037975.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/86567845110.pdfIn PDF document text
    • https://koratspring.com/upload/file/79112639459.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/jilatesesax.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34327e3d36---vepajaze.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0753610a8b18e1484c39e1f19b73fac5/53854394603.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/gb9e3j0rnrp3ro3c1eed3s3c11/81650575031.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d974cc4cca010e83e8baefed2781f7d1/54117603911.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vasude.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b301ebab3cf---famawazagijulemanubokede.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070811c11bb8---76385880244.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/gimoto.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/95859281978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=internal+root+resorption+pdfPDF 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_off0000b919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB919 15864 bytes
SHA-256: 27706f49a2b5ab5f57e21636c39e94dcc20d973f7381eb9ebd6a282c8bace876
font_01_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 10440 bytes
SHA-256: ed332f6c6294fc27928a17c88ac81751074ec892fc568b976831c6a442f06159

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