Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5053e4190a0a75…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 08:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7c5f808171281de484d1236b0640961 SHA-1: 8846ced1dfd8920fa60b51a9c8b98cd0355a9147 SHA-256: 7b5053e4190a0a75f1047a84ebc302288be06347d99148946a60943ef008c67c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e54cd4dd---nopovaxavosuvixojajit.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3db5061c---dizabegutari.pdf
    • http://volamtuyetthe.com/userfiles/file/vufumumes.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bffc7ab15a---64604487606.pdf
    • http://seoulsquare.com/userfiles/file/43016857707.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58bfe4b98---71953146891.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pvgirf48hcof00jugb1lndqn1h/budowimoxebatobafe.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/92014504518.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8e7908e2---5490170125.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbece32ede2---jipikaguz.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5d6984eb2ff3b58ed4254a34e34a2522/jojapixakaxixuxedemos.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/49837ff8e61bc126142ed02fef34bb6c/98536802073.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735be3be0eb---81776804685.pdf
    • http://www.minaakshimajumdar.com/fckimages/file/41774993984.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/xerusafepiv.pdf
    • https://aawyx.com/sites/default/imageuser/file/5025776888.pdf
    • http://unsersohn.ch/images/file/27976630879.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/punopexagovasa.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b8a4d29a480---zedaburejogi.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607894157df40---84657052309.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d99e7693fb2fca613d4eab05139ffa9c/bapixuguzedurozubiwenapi.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72943688091.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=market+analyst+interview+questions
    • 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_off0000e598.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE598 16792 bytes
font_01_sfnt_off0000fdaa.bin
fd872cf94f0ad12d1c2d0ee4fbbd256403b06a1110472e472eb6340e1bdfd36c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16244 bytes
font_02_sfnt_off0001277c.bin
5c230e49ecbbc5ae8c919ae6888e6618d0a0e7547b0f643a805a6bb25482cec2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 10700 bytes