Malicious PDF — malware analysis report

Static analysis result for SHA-256 1331ff5a3d12730d…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 08:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d217bcec5dfbc8794ff8822572b136bc SHA-1: 3a72cf97c06e1f21438c15dc87fef69cb672d67f SHA-256: 1331ff5a3d12730dc9c8c688b0b477d2d8ea7294267ea4f052f0ce1819f34a92
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, designed to redirect users to external URLs. The presence of numerous links, many hosted on compromised CMS uploads or disposable domains, suggests an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://garglob.ru/uplcv?utm_term=object+detection+research+papers+pdf
    • http://avatars.ru/userfiles/file/gijegofasopi.pdf
    • http://immobiliareborghi.com/userfiles/files/befeliwufemegi.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/95953966074.pdf
    • https://securitydm.eu/slicice/file/wofomimene.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/wivibugotaralak.pdf
    • http://frankifoto.com/uploads/pages/files/zejotarogudarowolesak.pdf
    • https://balticstroy.com/uploads/files/68557280590.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b37b81f2b---52251990716.pdf
    • http://gapp.fr/medias/files/wukotipebixekaxud.pdf
    • http://purepassion.pl/userfiles/file/kupajufipuzigemoxaperifa.pdf
    • http://tubemakingmachine.com/uploadfile/files/tipepotalitazikodugo.pdf
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/42556584644.pdf
    • http://geoplan.su/userfiles/file/33823622113.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614edac062225---nifofezexowiropedelul.pdf
    • http://studiopol.com/userfiles/files/25916743269.pdf
    • https://mahanakhon.pacedev.com/ckupload/files/8520742094.pdf
    • https://aonetreks.com/uploads/file/binabomixexuzofujoxomakip.pdf
    • https://ahha.az/userfiles/file/83986216793.pdf
    • https://maydangson.com/vietkiendo/upload/file/popodinafivelikaxikutib.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/24392994141.pdf
    • http://geobigoni.it/userfiles/files/xomiwiweve.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161587ac8b14fa---4555603225.pdf
    • https://mamap.in/ci/userfiles/files/mofigu.pdf
    • http://okudshava.ru/userfiles/file/73058654068.pdf
    • http://skolicka.eu/foto/images/file/korofupixowatemuret.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_off0000b2f1.bin
c0fadc05db3dde72923f08bb6c2f60982dbf7c2c3e1d1716ebebbe46f05ed5f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 10968 bytes
font_01_sfnt_off0000cc1a.bin
7bfcb85357827e76115cb0937a262e353d0530633a47abed2654ba89cc5b1281
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1A 13820 bytes
font_02_sfnt_off0000ee7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 16792 bytes