Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af7954785b32e07…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb98a62e888fcc42f90e8b47e42bc7ce SHA-1: eb09a6bf28d2ccb4dca73efa3ee600185404042a SHA-256: 3af7954785b32e07d992a12fa3a62f7f6187035392ee5b222d1d1fb130b8430e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to various external sites, some hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://barcabianca.eu/upload/file/48639483830.pdf
    • http://gianniarnaudo.com/userfiles/files/80769981498.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/28788095842.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1f1fa5d5f9c8c9ede840d8836cf8e110/fujekoregikekeji.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/guf6q45enf1sg3fd3ah3tko7ut/90615532176.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/29511611556.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3438f62f21---nuwigujelubixopudono.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/794c031f2f38b3192a070ef2fa7da49c/raxosamoborexe.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32679562b3---28944197278.pdf
    • http://radissonhoteltraining.com/userfiles/file/73274048445.pdf
    • http://uhy-th.com/image/upload/files/35609024556.pdf
    • http://astorandblack.net/emailer/userfiles/file/44149592147.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/26517951822.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbkg11c147rr5oo24c4veg5qrk/52330258370.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3354580b0---32867554518.pdf
    • http://avenue102.com/uploads/file/vebozeguvo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b998eecabcd---23400487324.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725417a87d9---visamawaluzo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ddq61nr1in40793kfdqivkuk50/jusazojibewevoxojogof.pdf
    • https://a2designbg.com/userfiles/file/suvaxujuzitexadir.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/de8dps83335fqcp37q6dcdbqkr/54381326753.pdf
    • http://club-integra.ru/userfiles/file/vaguwire.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/957a8ef1f0fbfbb73c9a2f6d022af2fa/45619547007.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083c79dccf39---tijofomux.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=ibps+po+aptitude+questions+and+answers+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
font_01_sfnt_off0001020a.bin
661990084a0329f4db63de3bbe7759d34ee2572f5bb620f364c0d46ee08ac187
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10868 bytes
font_02_sfnt_off00011aeb.bin
7931a0091c2e615ed53f6fd3f6eeb3d1ef6bdd45195b3d38fb22bde7d4e9e142
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 17236 bytes
font_03_sfnt_off00014829.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x14829 16092 bytes