Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96244aec0daa2b1…

MALICIOUS

PDF

94.2 KB Created: 2021-08-05 02:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee0536dba2b9cc6172795836c5546920 SHA-1: 0776f91f0d22cef58ffbc8820b3ec6acb6aac9c9 SHA-256: f96244aec0daa2b162328f81e3a47cad90c49d54d2004a3d1c9b0f6619aadf99
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, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting. The 'Fake invoice / payment lure' heuristic further suggests the document's content is designed to trick users into clicking these links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://111-orte.de/testarea/cwsCMSlight/media/files/mopobepixinezidixazig.pdf
    • https://n-v-v.dk/userfiles/file/zenetosowemi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/77qtubq2doj4v20vm6n07hcfii/gozonujinesi.pdf
    • http://brilspa.ro/userfiles/file///60287398067.pdf
    • http://allasclub.com/campannas/file/7146236686.pdf
    • http://rentbucharest.net/images/userfiles/bisokiwabamexineda.pdf
    • https://agmatbaa.com/upload/files/88535003307.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/28bd11b18d322d0042b5f85aa9606b29/maxofa.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/68d3a8cec0572574f2d5b0c1dc13b1a9/79002364279.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f197a3ab---74351596727.pdf
    • http://jtour.vn/userfiles/file/67716392815.pdf
    • http://www.euro-fly.eu/userfiles/files/bovizirumejolafudo.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede641a44ee---51860505519.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e11d85d15---63904416746.pdf
    • https://evrenmentese.com/upload/ckfinder/files/kiginomafutakaxofose.pdf
    • https://aksusu.com/upload/files/bopixiv.pdf
    • http://sola-brothers.com/userfiles/file/13054405999.pdf
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jusebifubirozafetaxazuter.pdf
    • http://www.hmh.sk/files/articles/file/96110962794.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5cfaa99ec8ee22060e6c450fd577874c/gusasupelakuduvigo.pdf
    • https://lotte-ppta.com/beta/assets/file/jamaxofobesen.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e35df06a5cd5914c7844c2216bcbcf11/bunugaxitoz.pdf
    • http://nbnjl.com/userfiles/files/ziboreguwinumitin.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/0bf56a86e3cd5c6d5a8fff800327e54c/gufilafuxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=financial+dashboard+excel+template+xls
    • 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_off0001090d.bin
6470e15bdb31af759a9467394fdd59fd298a076fcbae3820bdc761110b5f152e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10996 bytes
font_01_sfnt_off00012228.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
font_02_sfnt_off00013a3a.bin
771b24c584e4c3e0c3ef917ed0e69a3cf5f4766735210166881026eca71924ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3A 17948 bytes