Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f28c300dd5f759c…

MALICIOUS

PDF

95.5 KB Created: 2021-06-25 14:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f53a0fd79a99a8eea9baa390c9102823 SHA-1: 8e4170e62861a0000c9211f84066cefe1f919edb SHA-256: 6f28c300dd5f759c7acbc803406aa3d0b090f2f6f181f7df2b4e2264b4ec9ae9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, distributing links across multiple compromised WordPress sites and disposable domains, likely to obscure the ultimate destination and evade detection. The embedded URLs suggest a phishing or redirection scheme, aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://huntic.ru/uplcv?utm_term=intraocular+pressure+causes PDF link annotation
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/80efa4f40d0f574dc57d571c9ae81387/sulenarowe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8521f8ba673bbb3f8bd1e4144d8a67c7/lazojufetadeg.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqtovpfrihudgk8r1q5fvvssg6/61602859721.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bab8c38927---wobivekob.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/10779894312.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1584f83ff7---82920382718.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607db82338540---fetivugog.pdfIn PDF document text
    • https://aspirans.com/files/file/91301233904.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf50d769bc6---79963521239.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b5e3180e---faxofulegodunugapu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e14fa73e320701165a222b9d159f00d2/ronawibuwekuvesirib.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865dfaa3867---rozawumubiledoforititew.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/52321bf9ea9ed554dda440accf378a0d/xezul.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/2shcm4khat87k281kov8ro3vse/79787815215.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/375b924eb01b03cea7ca1b54882da142/8589202951.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sewujigubozasajovebisolat.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/35466117479.pdfIn 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://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_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 17420 bytes
SHA-256: 2113aa2153e5bc439edca8dacf4e53f824b3843549c8612ec9239e6f66f2855c
font_01_sfnt_off00014025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14025 10328 bytes
SHA-256: bdd8407b1fc0e930c5d4828e7091fae7660bbd6e07ffdf7de1620b3afdf55a4b
font_02_sfnt_off0001579f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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