Malicious PDF — malware analysis report

Static analysis result for SHA-256 357280befa312312…

MALICIOUS

PDF

107.8 KB Created: 2021-09-07 11:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: de7312ae91427cfc4f762133c69a56a6 SHA-1: fec4b73eea41bcbff2ee77b71bd735f5e85628cb SHA-256: 357280befa31231266b93f9e0f66460e6fe0c3fb944de7e7fc71612c650775bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Pdf.Phishing.Trojan' detection. No scripts were extracted, but the structure suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/e29d55759b3e453eb7a6a312de8c3514/55792948948.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160edc5b7df553---53709709868.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/xixifokepava.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/38517778768.pdfIn PDF document text
    • http://atya.eu/files/file/mudoloj.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/890922837.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1cnrqrmedqhf814l3jfdjfqq0r/filarefomimisepor.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16112117a8a8bd---sukiwugesemonasuduvodalum.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xabodapetezopib.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608895e4e3ad5---fubumevikisevurax.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/esbcg8lqagv1skqkabm14mhec5/12749390168.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc96639cd59---kewut.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa4f83af36---42843964942.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161273e7222822---91306205767.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xokug.pdfIn PDF document text
    • http://dentherapia.hu/files/file/7364034538.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c715d649---delijuviximuzibefolasiba.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/64378921836.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/83857842912.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/metulizinutajima.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fa1c851c---jigotovib.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126fddea6a53---28310822907.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/bupozorinuvubasutup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=concepto+de+garantias+individuales+pdfPDF 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_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 19192 bytes
SHA-256: 1b4972b02863fe74d97927f23e0e9b503ce3362bc9676f064319f3faae45ccba
font_02_sfnt_off000187e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187E0 10992 bytes
SHA-256: 8f2994eff8a73290e3fdee996c1ac82405e47dcb651c70ddebc91ffda19c2e27

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