Malicious PDF — malware analysis report

Static analysis result for SHA-256 073003e42b4ab0bc…

MALICIOUS

PDF

88.9 KB Created: 2021-06-30 00:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5973edbb04b18b5a9f0824a6da2631f4 SHA-1: 8c0700e75b245b9e4cdaa5d632e0927ea9a7a82a SHA-256: 073003e42b4ab0bc3d361b5ed363acdad074e2805e1467eaf11036ca9fdb2e3a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=how+to+get+seamoth+depth+module+mk1
    • http://bodegaadrover.com/userfiles//imagenes/rolora.pdf
    • http://tuzvedo.hu/elemek/file/jibosonolotafivuja.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb1893e435---6936289922.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/401b5280d31de1c2fe8da9fb184dad51/kujukafazuxipitukisanoki.pdf
    • https://anmoul.com/userfiles/file/64245631712.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbd54a641---52513456019.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/27ccb3f57d1d52bcc89584c1d7398e49/15883519364.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8895e9bb3d544645fbc91f4f8ccd4829/93564360642.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1b7e2bec---gituged.pdf
    • http://w-f-l.de/user_img/file/vowaxosaja.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795f67c8095---potulexowunesorelog.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160853b03c12ff---sedurulatazobavaj.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98418261481.pdf
    • https://mosconi.net/userfiles/file/zonagiwejesoji.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/gogozagip.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd86f90134---84372260515.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7118c9f3c---dabunoxerujofofi.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/29b738phbuvi0p9de93n78cg98/58810149926.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74595496555.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073eadba7e30---zalejifub.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c4ae63d436a79231c999dc0f23153e2f/tagepiwilelapeduxopun.pdf
    • http://ajtoablakcentrum.com/_user/file/bifusolalenufowenan.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fae4c0e8f46d151164c1a30c502bec71/dalifudafuzofoziwoz.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_off0000f802.bin
62f9a291f4c549116e125c03c4973a2818fe98cc1e3bf01383809f06e90ee8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 10864 bytes
font_01_sfnt_off00011106.bin
7e55ce2432d0d305cd3ae8d5d8f132bbce7afdb7cb77f622deb3198a59fbb5ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 17352 bytes
font_02_sfnt_off00013e3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3F 16792 bytes