Malicious PDF — malware analysis report

Static analysis result for SHA-256 3775c8e7f95fe996…

MALICIOUS

PDF

76.6 KB Created: 2021-05-27 19:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ab75392b5442ef97370296a2ae1c48a SHA-1: 5f8af1064d73f428dabcbfa96278a4c3a459d3d1 SHA-256: 3775c8e7f95fe996c0d6bd687ae72b831b64eed44eae7391868dbb0fd6f4f208
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+do+i+check+my+child+support+balance+online+alabama
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/988ffa3c150b0c71af3cd6e659a8a75b/jenobaloselut.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5e708074baad0c90e4e2a233e7fdb0b3/nezanimuzufenujazunegaka.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608527c0af6ea---tudusubizerokutivovib.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec089ec6e---50745923592.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16080dbc0db949---pozigimupesepu.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/812254bc90731212a18124cd4462878d/xevibatovepupivelapizol.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075581360e83---47719288535.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d94a34aa---11194296519.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/52b4d6fbfad1f03ad3b525ebb33740de/16617034871.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83df27acd---toririvodumenijuv.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gag0ukc8qn545vog0k0de8s7vc/4071217174.pdf
    • https://aonetreks.com/uploads/file/fijebosubeniluwimat.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/eb44bdcd49d0e6e1a229c8bbe6a3daa5/bamenaru.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff804cda9---58699319324.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e669c380---19588501625.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ede29t9c2m3pmfn5tsmp5ng2/74395780165.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_off0000ed02.bin
b707753bc93c8e3a6ea20ef07e07e1f486c80bd54abbb14debcb40ecf7181d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5672 bytes
font_01_sfnt_off00010030.bin
db4f1d96e569e2daa7e16945668350c4f0b826ca2ad3a8007c0e62a2cf30b5ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 10852 bytes

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