Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2a843711ca7264…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 10:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4dcad1a3b842e5b03ed9e164cccd4188 SHA-1: d5bf0786409b10303a9713006810fb94364f92f9 SHA-256: 3c2a843711ca7264dedbbb82f4211030b5955f297ae644976d68ff6c2977efd2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The embedded URLs suggest an attempt to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=lack+of+trying PDF link annotation
    • https://nhaccugiare24h.com/uploads/userfiles/file/13108858247.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/056aaee028aaf2de419efec4857c2330/zivememomugiwuz.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1024d880e1---52644143107.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d575576d64---36929340626.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c64bf048e---53536342451.pdfIn PDF document text
    • http://anpo.vn/upload/files/furesamekujowaganiwami.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/14ea5c0a23c802fa59c1eae4b61eafd3/73435152563.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/godejigovizu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/lezegefodaluzip.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/64418024350.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8afc164f---53881474924.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zurexil.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/74372063596.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efb8576ec---dagusujaleg.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e920439efd---tuvedadememesok.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/66017876956.pdfIn PDF document text
    • https://scriptdd.com/_file/file/72326730779.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/93008433111.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/riseti.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xutajegefeluwajebudomuzar.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/sg3o050gv6buhibcpg5ns29l7v/97772000563.pdfIn PDF document text
    • https://cristalensi.com/public/File/423924373.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/pifemogitalaxi.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/06e24ef1dcdb9413ce64b384239a0b09/17780372480.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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 10328 bytes
SHA-256: 4c8c633d21fdcb823fa7d9d949d2f5774b814ef3dd4c8edd3ebbec1571b67609
font_01_sfnt_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF747 19164 bytes
SHA-256: 828ed6e02ed1c53a2deeac0e64e9f7e5c41d19bca27a82b2a3546e51f7a6c1c7

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