Malicious PDF — malware analysis report

Static analysis result for SHA-256 6badbcfbde7e6a27…

MALICIOUS

PDF

83.2 KB Created: 2021-06-30 10:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1fb43f8dc9cfb5bbe839018fea5b2e5 SHA-1: 84c4550a482543230411cafeb535ccd9b48dd3c3 SHA-256: 6badbcfbde7e6a27e4f2baa7b11df646a92b8bb95660908b1905d99093cdb634
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the document is designed to lure users into clicking links that lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e840a634---zafupetubeba.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/2d4557b920274466b04e0c6961b3bb83/74062083922.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160819f1569e69---94328021302.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/r95o9s2r90jnb794dv1sbqo776/kuvapetemakoterifa.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/p1o46ii7pqika6dcpt3dgvk8k6/45841399538.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/ht2h8h6s7osrp2k8lsuf2f16v5/65020061486.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1492726de---44329877535.pdf
    • https://annjulieskarpmo.com/userfiles/file/30030241081.pdf
    • http://jikaramen.com/uploads/files/15462040647.pdf
    • https://agentcctv.com/userfiles/file/waxisor.pdf
    • http://goldenpoolandsauna.com/user_img/files/zibuse.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a74d32ad98f---bipuwosebanabufil.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5093d8c6e---75543421259.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d3975908b2d1f6cad722b52bead898ee/52826226882.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4a979380a15d1e24a3b9d63968bfe3b3/15391333154.pdf
    • http://briarcliff68.com/clients/71184/File/gerodimimunonaponorisurow.pdf
    • http://nhuaduongnhapkhauaz.org/upload/files/13223239629.pdf
    • http://macautemple.com/userfiles/file/25289855673.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/9ac3b0e5929976997d3053edc9edc33b/99366850687.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e6cd443db---51010916645.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22767f1256---marotigatukopikigeko.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092afe2b2dfd---99629777237.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fa871ef6a7039e06094d765049327a36/bosifudasitazid.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=intermediate+reading+comprehension+passages+with+questions+and+answers
    • 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_off0000e17e.bin
4034923d231e60a2987259c6e2e850c32c5fe156f5df41193dca127267279b65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 16764 bytes
font_01_sfnt_off00010d35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 16792 bytes
font_02_sfnt_off0001254c.bin
95aaa8a18df471d08ceecb861ac920e13ec9028761cf3997d555ca123836ad27
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 11200 bytes