Malicious PDF — malware analysis report

Static analysis result for SHA-256 408d041b1abe2340…

MALICIOUS

PDF

75.1 KB Created: 2021-06-23 17:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b369c99aeb4b52d9bb99dc86fc3c535 SHA-1: 469d6e775ce30df0d4ea85c59cc4db208c7541e7 SHA-256: 408d041b1abe2340197e3b0a0aac8a7589b922eb848bac86ed9f446b9e6eda6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to iPhone backups, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64eff88a7e---nibunet.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1bdf1e1f20f4537ef58fc3596926dac2/dinudegulijiloduwuk.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3d6fbba1174ff8f98ca5d920c2bf7762/24782421600.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b2fd4434---naziliretizan.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceae056958---bukiv.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/fa4iklue5j8up764hk4qvmrp55/vatofumemufitej.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/s65kvp2mp78igpq3dcf7mccklq/fopedubevoji.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608673e756742---wopitajijimulaw.pdf
    • http://feast.to/upd_file/mubisexikabed.pdf
    • http://jinistudy.com/_UploadFile/Images/file/muzofizexumaferoveduj.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/hib3ni1u8o48obb4m4ej5o7l0i/44463454216.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a04adf7b8452ff4df77d6597dff16a69/fulovamimolojivatopak.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160757df580bbe---19576845510.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/830eb09c96efb40cf78d38e98f91e429/88437750720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+manually+backup+iphone+to+itunes
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ac.bin
087133a99ee37660777edbbe6c906ea8a5459b05ce2b4aefe0386f270b20c4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5436 bytes
font_01_sfnt_off0000fb14.bin
1bfab757d371a34804150e93472ea1d93f097d93ea46d2c92244672e5af29df9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 10712 bytes

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