Malicious PDF — malware analysis report

Static analysis result for SHA-256 c447244efa749abb…

MALICIOUS

PDF

82.7 KB Created: 2021-06-27 13:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f632583962a4ee4fd1eff1370e4211a6 SHA-1: 655ac069f1e2d8b1ec0b46f2ecdb4b6484e0a104 SHA-256: c447244efa749abb70d6a4c5ee445de4138f90778df9e041c7fa732c32833afe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://laborke.ru/uplcv?utm_term=trip+over+meaning
    • http://tradeweb.es/userfiles/file/fanogigepegobufabugu.pdf
    • https://arrayamed.com/userfiles/file/21486721787.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/vs91nv0347ctp3kfl5p4eob3h1/87059319236.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a20f53762bb9b21c6fdb32d7da607e74/42645674002.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4123a607b2ecbd1d89bac9b88d2801ec/64145650041.pdf
    • https://damsindia.org/admin/uploads/file/66372942159.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q7fcttjuuulml90c9id8hso4ca/38491710435.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ns0t3a5haf921nfbe40j1bc3i2/95480541404.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8704c74cb0---82302718617.pdf
    • http://esoftland.com/userfiles/file/85894380973.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608010218402c---tutag.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5e8bc58f---32227664531.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lulebuvijuzinalilef.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd431943d---96046834529.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607624e216de3---wugorezese.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895fed79fe5---73494726761.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbf6c3bb3---lafubunuboxifi.pdf
    • http://cdhsalumni.com/clients/28864/File/junajevijamuzosezefatoton.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/347b13c58b2834af91347c5aa5fa64dd/kifizuz.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f690285072---savobikawubozuv.pdf
    • http://coeb.eu/userfiles/files/pules.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a302537b48b---15888349161.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/91352103890.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_off0000e431.bin
b9047b26dc9e4b32376139fc22cde8d22aac5abaf6cb35a0d0317a1b947e3cc7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 10312 bytes
font_01_sfnt_off0000fb5e.bin
03dfd6e98944cfb4d406b4533206ef333bcbae6f767a66483d7f183d50a481e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16388 bytes
font_02_sfnt_off000125e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 16792 bytes