Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a29114eb138299d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 06:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57801bdac0a1e9454a7bf8be0a449ad4 SHA-1: 61bb23dd8e5be5be5cc1477aab0d03e6e6ee1611 SHA-256: 3a29114eb138299dee3df94fa30841c0a21432f2d51d413c3acba2be9a7dee6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

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://budapestpainter.hu/ckfinder/userfiles/files/20040384791.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.pdfIn PDF document text
    • http://esipro.be/userfiles/file/xezaramifajolaxekifa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c92feb72494574f9ecd91d28e05a2f6/guvosavuruwupuzito.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/32115639545.pdfIn PDF document text
    • http://warehousetraining.ie/images/rajujigavori.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/wefifeninepadofidoruri.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/fowupatarozuxifopo.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/635341592.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/43612714338.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_010446.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tipagakitodomewukig.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/topodojodutidudomedoduv.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/ripuvokala.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/83240409300.pdfIn PDF document text
    • https://dellrein.ru/content/file/fobugewetos.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68631285291.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109111152203876.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76888113863.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/61059822819.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cec726c5---sepekitenuvujokifudabeli.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/legad.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/pekaduwajewamizipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+game+no+in+app+purchasePDF link annotation
    • 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_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10896 bytes
SHA-256: ac59c5ecc972d2de7d9fdc6056a145c7fa5a3638d0b51473db03a58a0f91af80
font_01_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 17792 bytes
SHA-256: c22f2a52a9ed885d443cb4512d916ac0b7746a0f3fa66e971fc06d5029a537b8
font_02_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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