Malicious PDF — malware analysis report

Static analysis result for SHA-256 933b2f8e4b2151a9…

MALICIOUS

PDF

73.3 KB Created: 2021-08-28 06:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5843d10999b5cdddfc62fdd627c497ab SHA-1: 564c746c0fc3d06688edbfe4e5cafea1c94c924f SHA-256: 933b2f8e4b2151a92d461605a8c83157ac35478ad8fcbe0d73e3ca4102f55760
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=wendy+shay+ft+shatta+wale+new+song PDF link annotation
    • http://szrealty.net/uploadpic/2021-6/file/2021060610321073499.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b119a203a7a---51414601405.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/52399021809.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/pasonejazidazidi.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/21252672992.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/19500692383.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607efba8451e0---fanerafixinomu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c43d751b186a6cc411e62f3f527b4179/91015837080.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/b6ec32e0ugqk7t7ipcrm0oks2i/dogirusirowusev.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/70915594340.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/034e16cde878754eab4cf44c5ae8e27b/3744597459.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce2b02a47---49298279459.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/soxikurozewukiwetaled.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7kpui1sc759nc376420mgqk0r4/panurojopafifadobebezosaw.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/pigalobujijewerimezalarew.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/83478382767.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/afd342554ee3470d3de52b85e8336d7f/mojekunadimepi.pdfIn PDF document text
    • http://bronia.org/userfiles/file/36059976003.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/10629858591.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/26480852931.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14eb853be---dikojuvaxo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e310346b09f---1347938079.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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 16544 bytes
SHA-256: 9dd7d205c22b9fa77101883f2e5549f99a0d7504f1dc58b7f2e10f24ae79dbf4
font_01_sfnt_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10636 bytes
SHA-256: 3dc73a8b84f87838c7cb905624ec14922b637775759a5041682b2e131cf6be60
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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