Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea45755c2e9b26a4…

MALICIOUS

PDF

82.8 KB Created: 2021-08-22 20:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2bfaff3905b3487f68dab31a409cc64 SHA-1: eac277dfd693fde9384ea30297f68bb55302f447 SHA-256: ea45755c2e9b26a4c54447e4e7d456035fe99348998f61107de2ffdf01e8858b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://stbenedikt.ch/userfiles/files/fazanojumofuluxafedafoxes.pdf
    • http://domainecomps.com/documents/files/38426943495.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/52134249618.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160782b6d68d70---30937251880.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5fd40aa98127a6e982fb43756d4c8055/95342544994.pdf
    • http://dailymaytrogiang.com/userfiles/files/49835997284.pdf
    • http://diysmart.net/userfiles/file/62152219209.pdf
    • https://istanajp2.com/contents//files/lukepozepif.pdf
    • http://robalton.es/Albums/images/file///84074236870.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/911e50c2e80bc2386bd19d58d4ed1a14/95640258298.pdf
    • http://hrdiborice.cz/erucom1/files/files/zakis.pdf
    • http://dok-vo.ru/userfiles/file/8576782552.pdf
    • http://rzn-house.ru/upload/file/xeludibizibigobaz.pdf
    • https://webaprint.be/img/file/34587841444.pdf
    • https://cobaltinc.org/userfiles/file/xevuxexelazewusufoba.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6eb0f59be9fc70569f1c1c7e96013e05/zopewigaxitupaxat.pdf
    • http://aliglobshop.com/userfiles/file/95322809536.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/32c8b5fb6c16afacc25240f873a918dc/80871356731.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2fbf4e028548a1709f52bdb3fe7b680f/dopelefogazik.pdf
    • http://botosani.ro/img/uploads/file/94125101520.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/qhd7k9k5e5t4lehosr7s4q5kje/36300686323.pdf
    • https://nhatngudongkinh.com/upload/ckupload/files/tedel.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/93281829318.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=periodic+trends+test+review+quizlet
    • 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_off0000e21c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 16792 bytes
font_01_sfnt_off0000fa2e.bin
34e925ccef7d0fb925fb10a2b9b3f85acea5769b4ac15a8c8371a4a73aa21a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 16364 bytes
font_02_sfnt_off00012487.bin
9423f827c1360523f35c484f62b372103e30640fcfbe2b7739324c47d0840720
pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10660 bytes