Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5481cb32b7067a…

MALICIOUS

PDF

87.3 KB Created: 2021-06-10 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6c7d81f4808a3c594cc6068b7116da79 SHA-1: cfa3fb21aaf9de43e31a96cd285e72a404d0c3a6 SHA-256: 4d5481cb32b7067ae8123a713616536fdf974c914604a273c0fc9543b46373ce
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=the+accidental+prime+minister+720p PDF link annotation
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/54pvbocni25f65v79fm5s536q5/39016910941.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zudojesulawuzut.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc0e142c21---fisifexevejuramotile.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/ve6e0vjifaeeus70hn6aap5uq4/kadunigidojudir.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/jedisuvedikemogenazilas.pdfIn PDF document text
    • https://pathakpharma.in/singhania/downloads/file/41911238341.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bd9tbkbj35n90ig3c5sl08p86i/2546193049.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607727266f446---54021788804.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/gtm9cdjpqctp32btkrlt731dc0/35059933228.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b60c22e9a20c0fa6dab0edd680c2d6bf/nonujani.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/h89obndaco8k1rttj1sgnpviuv/19538110928.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210513211200.pdfIn PDF document text
    • http://cocoal.com/uploads/file/48804082046.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c27c091f---bubapo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3d1141ce685502ce06793cbe5d85291c/pupugososab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn 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.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 5616 bytes
SHA-256: 4d93d975bfda2393cd0ba312e2b3d8ce50f7923a58d2f142065d62cd8ac7c71d
font_01_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 20968 bytes
SHA-256: cb30ccbe3470e24abea742643761fe43cfe74664858df86eeeab0c9a4c342ab2
font_02_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 2276 bytes
SHA-256: bad47d694a1dd9c664d92593e9aa530dcfdac95caf8f68d8ad6f6049d2ff5117
font_03_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 11312 bytes
SHA-256: 7a78cd4d96e3bf739678bbd5f56b3279d2c14a3db257ea10925c340a0348dd23
font_04_sfnt_off000144a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A2 2056 bytes
SHA-256: e56f5db8faf554166087922806b3819c377976d94af14c6b8a512386de68c265

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