Malicious PDF — malware analysis report

Static analysis result for SHA-256 b703afa808098643…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f65da16a83bf34570632e6ef37060a4 SHA-1: f4d19a38630bbf584b6dc2fd14e1fc037164183b SHA-256: b703afa80809864359368c611f626402e3d15f47980af1abc67cc7ba9fea5334
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a common tactic of using seemingly innocuous documents to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bidmitt.com/img/files/file/18823900525.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/6459718004.pdf
    • https://a2designbg.com/userfiles/file/zevolikevux.pdf
    • http://mayjack.com/upload/files/54041296846.pdf
    • https://alianzatours.com/imagenes/file/mituredij.pdf
    • http://dges.in/userfiles/file/84945073607.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vk5n5m3qhnnjdmtboj3lsr3u82/wazaw.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9581073c44ed7f62e355d748970449f9/11035903618.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d7d0da5db---65425488761.pdf
    • http://alexlunacoach.com/img/editor/file/tufixepedumosuxejimenina.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/gusiradiget.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/43969561668.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/422663308b5e11bd96f45f57e7f35cc7/vuxuveboxutoxij.pdf
    • http://jonme.net/ckupload/files/biluwagilasikemusu.pdf
    • http://patp1ryb.ru/media/file/gowafokapixoluxaf.pdf
    • http://imoroz.by/upload/file/87430680829.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/98216798565.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b898de25---74233764845.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/bc444b54d755fbfa131558ecd4578a97/wupatodibo.pdf
    • http://webmba.fr/client/logo/file/talotewopadilewutopew.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf73fc802e---sazajejedipefokalefej.pdf
    • https://auto826.com/uploads/files/63884772478.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2915f2a6c6---xutopabesofaluvez.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8108f694---59469861864.pdf
    • http://miskolciharsona.hu/pictures/file/gexolofevomisumedozumub.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nonlinear+analysis+real+world+applications+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 16792 bytes
font_01_sfnt_off0000d46e.bin
6e41e4c1ef41b4bc5146430b6621cb8e135fbe86e6d862b9ce55cd75063991da
pdf-font-stream PDF embedded font (sfnt) at offset 0xD46E 17612 bytes
font_02_sfnt_off00010237.bin
15e803639a7d6334d7da83ee26b5ff28e6225b46fdee0749e579e774e17c3578
pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 10792 bytes