Malicious PDF — malware analysis report

Static analysis result for SHA-256 a791f307875760b0…

MALICIOUS

PDF

92.5 KB Created: 2021-09-05 23:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cc225fbbd05a5b3698016c13e0c6bec SHA-1: d5f068df47643f41f90f581bc7250e1c4518c490 SHA-256: a791f307875760b05fcf88efd194c9ece4f1591b1d991248874ab8e06ec9333e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress upload sites and disposable hosting domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially exploiting embedded vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=alumni+meet+report+pdf PDF link annotation
    • http://scheiden-maassluis.nl/uploads//file/pureros.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/60617254044.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2245756a1da46763277435958dba5e06/susigosigefejesifo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/giwudatesal.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/75764891179.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/tebosalofi.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/manopofumatu.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/mumenu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161187801bb078---89928378142.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/br9afmstu55nbg233tpg2pnoo8/fekeriwonufelefafiwinube.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/tukof.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad9f13dd0---419274818.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7146bc7e4---fedopuzu.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/laxigesedovawisodi.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/bafigogukun.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197da78bcf3---duxepunevivumud.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dapevojedopazepom.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e05d10da9---74652110103.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/subuzebozegizav.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a0acf851---rimaso.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ba8e155ee45c218ca6e11dbad946dbf3/zeterepuzig.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/18003370502.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f99f997d2f---16344649730.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_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 10408 bytes
SHA-256: d8810e832a9920ebabb4e24c4217c606bb6f8f40a0ec5eb3cc7e67f8963b4dea
font_01_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 18424 bytes
SHA-256: 38c76da43d075c95910b69b3eda80cb84cdfedfc35ca9ee32583e27cb8b375ce

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