Malicious PDF — malware analysis report

Static analysis result for SHA-256 402fa89fbcb0cfba…

MALICIOUS

PDF

72.3 KB Created: 2021-06-18 07:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89b9379d7987c90fbba5791257781586 SHA-1: 4a5a5a89a85e61da76df5c78ecf9c96fb965f96a SHA-256: 402fa89fbcb0cfba17da592918bbec771b850b38a88361576868d0c98bb22c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised websites or disposable domains, suggesting it is used for phishing or to distribute further malware. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

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://medvor.ru/uplcv?utm_term=animal+intelligence+list
    • https://foundryindia.org/userfiles/file/wuxibejubekadujukezujutug.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608609e5d1807---zadojatanogew.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078f8291f54b---nibofesufidibuv.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e9bd27ea990a5c75bfc8f56b45371c0a/95664480718.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8b9a5a61f5b6f178126653d1388bd78b/dudenonesere.pdf
    • https://adsbudget.net/userfiles/file/kidavaporaxatiw.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g42g7hi9n2egni1s21ud4bvpcs/4519325319.pdf
    • https://alatheir.com/atheirwsfiles/file/45407369240.pdf
    • http://aftckwt.com/uploads/file/43183339104.pdf
    • http://mega.kz/media/upload/files/78007217735.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a1c56f4oj99urvt1renco7j2ru/dososagufeteruwavogovip.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fad11b13b8199a31682e63e39877a308/90303508852.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d5cc6d99246bba52821a1e17da345486/34652764919.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/844ccdd1f433deccd3aaac745b6a7ca1/raman.pdf
    • http://ipublicity.cz/data/file/wugebademugoko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000de64.bin
124b88d0844dbd03a30d7088b4418dd32679728b8c82243796632b9d67f11196		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 5012 bytes
font_01_sfnt_off0000ef5f.bin
58ec8e86e6d54287111a1a95870d29b9c2a9b0eb3b1d32d555cdb14e5c0bd4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 11420 bytes

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