Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bc63ea8c5e2353…

MALICIOUS

PDF

83.8 KB Created: 2021-07-07 17:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5ce7c7e7352812292dc6e05d9f13248 SHA-1: 2d63cb3e5482d5699a331aa0c437e0e1ecc3b59d SHA-256: c6bc63ea8c5e23532be5fbbc6306fcf984cf810ff1ab9e34e3c9b6ae72facbeb
96 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. The document's primary function appears to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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://fedico.ca/upload/editor/file/fomewizepomasagegidi.pdf
    • https://relans-nn.ru/images/docs/file/12907029591.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2bai9s4rr82evghqt7ptbj1n53/balinapibowelab.pdf
    • http://hugslock.com/app/webroot/img/files/31802534366.pdf
    • http://smartickgroup.com/userfiles/rirukuvoga.pdf
    • https://angkaganjil.com/contents//files/zupavuzewarisanaloz.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b5a6fa92---98555230155.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2gkj8lnvjnhsd0ef6t22jueini/35673890581.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/nr99fct7ng2t02oarl2764k4ac/jobipedubixejegadonod.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bcaad4032cafde6b7d70c7664923ad9e/zikupojanore.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a7939a7ce4aefe97c9691c7d8d8f3777/86715157714.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ce35da78dceaa85ce17a0f7ae6093360/sojovuwukurax.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/b14936ffe20fc431e7c3e7b3b745a996/xubemufajuviwewakunimeba.pdf
    • http://piazzademarini3ge.com/userfiles/files/xekozibuterixeg.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oeukrq2j0njvt0li49qbq2bnu4/kinesosinurezufa.pdf
    • http://diysmart.net/userfiles/file/bulebeva.pdf
    • http://davidhammerstein.org/userfiles/file/15766509238.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/pabgcoqfhnre09cthplhbk19pu/29209228903.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92a8dffb4---26715693247.pdf
    • http://alituncer.com/userfiles/file/57200990935.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ds2l0lcjr5202imo986oi0ecb1/fezorizamofefulo.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a168ed66b70---85251405063.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4d106f12f---powotudakopujasoxo.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210628074712.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/fti8f62inea6fhidbdr1mdh7pr/xapobuvub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=20+dollars+in+my+pocket+mp3+free+download
    • 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_off0000dd5b.bin
31e5e8c3b516c9dd0249c9d5f3fa1ff2c76ed8f1aa30d1c845e70387d0503223
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 18096 bytes
font_01_sfnt_off00010ccf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCF 16792 bytes
font_02_sfnt_off000124e6.bin
98a26f75f06a2b375581c25d8b31d735df243c3f881aade1baae7a4ec80dc729
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 11392 bytes