Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c1d7151dfd7432…

MALICIOUS

PDF

92.8 KB Created: 2021-09-07 11:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70e167d251f22a55a1d094c4347f9c56 SHA-1: 5713736658ddba2bfa9ea48b56fb44d1bdd7dc34 SHA-256: 42c1d7151dfd74320cc371ec83aca3571c61eebcb72438d86bf0be73d3f577b4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ff8095738844b1c005419c103f1c5f4a/2481808860.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/pukejebuxagobono.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5173ae7f0a---70452206796.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160995f4e60058---61210318182.pdf
    • http://ahcxdq.com/uploads/file/030942306107.pdf
    • https://e-room.co/userfiles/file/30616547084.pdf
    • http://usmleworkout.com/files/file/58016732573.pdf
    • https://sanidom.pl/img/file/79235326704.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3fa3eddba15b32f3c5c25ceb93e29983/silosisupurusuvus.pdf
    • http://ecole.ru/text/images/file/16597803963.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca048f39f---28387203700.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8655c143e---58121454128.pdf
    • http://saigondome.com/uploads/userfiles/file/86658631359.pdf
    • https://mygoaltv.org/ipp/images/uploads/files/wisujiralamoxip.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/as0vf0fg4sv0n8iso8qrcn1cg1/ziwezoba.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d907e6b78a---dimisolaxumibi.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cb47a37d---42933356041.pdf
    • http://gryfarmerskie.pl/pliki_wyswig/files/72094244278.pdf
    • http://fkjz.cn/upload/files/2021/08/202108100502098299.pdf
    • https://mavachhaiphong.com/upload/files/86103264148.pdf
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/vibozozurosalanebugijag.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/kuxajemaf.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1374tlruahj8d7799ktqb1jj9u/69935641495.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b771d368e0294f7b67c6247190de271c/89521944914.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3529c1f92---63570656763.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/5g84nr9buhskatjk28o9a2m4aq/50575192763.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=horace+walpole+the+castle+of+otranto+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_off000106f5.bin
82674ecfce63bfda1fd3fc63cfe58ca9e0e2c3fe96155451cec3abe970cda553
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10700 bytes
font_01_sfnt_off00011f81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F81 16792 bytes
font_02_sfnt_off00013793.bin
c3ed5a3343cb2b16eb8719af3d31c70d12566cc5df0fc6fd5b86250ceca3411f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13793 17784 bytes