Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4a13b3bb1a0462…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 026c52265ea1c4c8dffc5f83c3a5a70f SHA-1: 8ef31c60bbbc91a77234f2228257bd94cd6a7193 SHA-256: af4a13b3bb1a0462aa50a92eef5f247b4f86ff59c82f8c4c389ccef0dc5ae3ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://wastran.ru/uplcv?utm_term=svc+chaos+unlock+characters
    • http://gptools.net/userfiles/file/luzetiretonamosute.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b0ca5abb---66769153996.pdf
    • https://invest.pl/userfiles/file/6214980478.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kq3vpkr564okad0e6k2tcpg8eg/zawoxikebizex.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/848f07bce222944226c9213549000f48/bagutetijetu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c34a20ec85e---20437468337.pdf
    • https://flardochform.se/userfiles/file/61862916631.pdf
    • http://brandnewgoods.net/userfiles/file/95594890846.pdf
    • http://www.mostenpo.jp/userfiles/files/13004483430.pdf
    • http://klefmarken.se/upload/file/92917065883.pdf
    • http://abwmountvernon.com/uploads/files/vutalizax.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074ad6774e98---tokamatilikelij.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/57067075950.pdf
    • http://allasclub.com/campannas/file/70954325720.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f08kg7ndrptia77uhhedtmickg/17841417964.pdf
    • http://orderleesushi.com/uploads/files/daditubarekiwazaw.pdf
    • https://actor-conseil.com/files/file/22082346194.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f59fccb6f---43078734935.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a35d2d906afea4ad310ac14539dd8500/noxemo.pdf
    • http://mikomisushiwc.com/uploads/files/pekuvedawitonosu.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083a06a4f9ed---xorupujifadoduwinimu.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fb65c9ff---1579048335.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b25da89b---26253504209.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdfddd2375---91549633514.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/47c5788d6676bb78b0248567459c9927/zagimuwiti.pdf
    • http://flygarfield.net/userfiles/file/xosovubizudawo.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_off00010045.bin
d8846894beca6065fe79810c96911ae2a2971b2cd26af8017fffa4d71df335df
pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 10568 bytes
font_01_sfnt_off0001186e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 16792 bytes
font_02_sfnt_off00013080.bin
62b84952396db2869085c7119d553cb326421945d1dd447856c5cf5074c3ae96
pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 20520 bytes
font_03_sfnt_off00016504.bin
24099b792054a1db7000b2701988a7bc0e77f1028581612c5d0da95e4b77355b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16504 6148 bytes