Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6514dd3b4aef3a…

MALICIOUS

PDF

85.4 KB Created: 2021-06-27 12:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ac925dcdc41d54ec3021ee97e498d61b SHA-1: 42486274970937db34e0cf51abba6ff13d367b07 SHA-256: 9a6514dd3b4aef3abc22926f7df744055d2af853a7f5f884add11e89dc17d754
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress upload storage, suggesting it's designed to redirect users to malicious content. The document body was unreadable, but the presence of numerous links to potentially compromised sites strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d69e27820---34742450903.pdf In PDF document text
    • https://anctools.com/ckfinder/userfiles/files/gitezovudetobu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8710ce055ab63f6ee34e468e8c06aea4/45962111268.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/u5djfqvsvgi0tv60nds1ad08e7/22802332772.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff7a7cedf---vukapiwunoxexajasen.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/353de0001015a21973773ec1b4f87649/gemalipopumimugi.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tabulirunezaluziligagis.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/xowufolu.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/54847216857.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/92734884939.pdfIn PDF document text
    • https://kede.org/userfiles/file/64921455719.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/8vomplcj1vap370r37paial2oi/88745873520.pdfIn PDF document text
    • https://marigabung.com/contents//files/56275143766.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/wobedokidodep.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/b7mal3gf4ak1v98l7ol8ofisp4/gosarigagawonuniti.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/840f4c0889301db1356976be428e92df/ludedalipomapo.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pejubikuwinupagonapebapod.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/83167c2bb650c33082f38616bb4484ff/41357598434.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bt9vpq8og39tllap6fqvqg1rkt/bedeketiv.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/jogub.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987fe113981---xodofabififebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=use+assumption+in+a+sentencePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 17032 bytes
SHA-256: 5b1ac153b0e7d51d490352706d37f7b8b572675e532d200d4177aaccf91dde2c
font_01_sfnt_off000118b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B8 10496 bytes
SHA-256: f07b99fc518f2d25eb19ac7a90cfa97a7c05f4f77521a6d3a10f124473fce50b
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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