Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6603cab273ace7…

MALICIOUS

PDF

91.0 KB Created: 2021-09-17 23:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56ecfe6e0fab2f77937fc8683abad2f9 SHA-1: ccaa128512b3b72a72efeada70900432c94f21cf SHA-256: fa6603cab273ace7f6c8ac65f1e9738cf7ec6e50bff6104458e828c9747bc8a5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be disposable hosting or compromised sites, indicating a link farm designed to distribute malicious content or phish users. The 'SE_CALLBACK_LURE' heuristic suggests a phishing context, and the ML classifier strongly flags this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=smartphone+cpu+ranking PDF link annotation
    • http://sushistoryus.com/uploads/files/dixexuturaf.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///2171330090.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/69618313407.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b421034f3cf99a9b0b10af804c9d48f9/11636160004.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/sovozawiwizozus.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/mepowebibogexuzuzimad.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea3f6c18c---tizumewebuj.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/figoxozi.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/26156595553.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f7gpf5hl5fi4c53apc2noe8c83/xelovu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613477e6d418d---50508218792.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/26896317335.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/fowipipujaxemoguw.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/zixarezirevo.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/murowalajoduribikexaz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161391119c1d49---rigoteketokodut.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/tileve.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/19641857863.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/57954665008.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/famiw.pdfIn PDF document text
    • https://qnzar.com/files/89591962997.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909064834.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/11002175946.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/sevojusavoluxopemutim.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/noxoparafujisebutorotina.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_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001154a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154A 10872 bytes
SHA-256: b2b0b678d18cf2243ff326ccd4b908f1aa6862903006868b75f79902055b142c
font_02_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 18332 bytes
SHA-256: 4c9afc146db1f31f9eab9f42c6d474ec217af22a673ca79a1927b501df30dd0a

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