Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd97a4961c1a528c…

MALICIOUS

PDF

84.7 KB Created: 2021-07-14 07:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 425fffcee7fb9e09772469e32de81c90 SHA-1: 7528b905436f12834dc9cf8dce220442be125000 SHA-256: cd97a4961c1a528c6c777b195b60581e1983d027246a5538ecc49c66c7b67a9a
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple unknown URLs further supports this, as they likely serve as landing pages for malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://audit-advisers.com/userfiles/file/mufoginumifewap.pdf
    • http://stilistspb.online/public/files/uploads/files/bogigosupijexano.pdf
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1ced015e6907477c52bb8139a1eb7e88/sojusos.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bec16c68f684d3845138aae63d6c1658/85269976031.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cf13d9e5bef87ca80b7f6c1c0c8aeb5/nimitudojun.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a55dd87325---74853030552.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f4a2b51e---99030649554.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/28e6648a499873fd4b260c36dcb8cebc/kitibegatavig.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/7nfi6b25hd6621rb4dcq4ookjh/70472245773.pdf
    • http://przedszkolenisko.pl/userfiles/file/vezepimegozutojutojib.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/cd9e847ee6b4898ee6db1dff33a4f66f/19849723440.pdf
    • https://smartdeal.pl/files/upload/files/15327673927.pdf
    • http://vtvxm.vn/userfiles/file/56482743098.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1ef14e1e---mobof.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94c9c2f8c---44489066709.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cef4bd4681b---67194247449.pdf
    • http://metall-press.ru/files/58686473419.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/rlk6g5on1dadutqu94dvi2a7o0/14310548014.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/tiburidulakemaguwizeg.pdf
    • http://regcureguide.com/files/files/57592535614.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/wejunaxowuwizemusamuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=presentation+outline+template+word
    • 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_off0000e8b4.bin
c7248caaeb218e28a45a36d62af3d113131f42bb230446e0353b9514f7f94ed4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 10740 bytes
font_01_sfnt_off00010171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
font_02_sfnt_off00011983.bin
314af6aa5cafcfa1f3963b0b7e3d07ca1c4b00efc934baddb9bcd554793b95fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16404 bytes