Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a32bfe7e5439cd…

MALICIOUS

PDF

103.1 KB Created: 2021-08-17 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 529fdb0b8797cf0b9f90445c58332dc3 SHA-1: 9a13b9acd1b04d8a51b3ed632ce99da81e85ecc7 SHA-256: 83a32bfe7e5439cd83e7fc8321704ee3993bf12daf4be5ae52e5ccfa96f1b6c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://boumqueur-edition.com/upload/fckeditor/file/82603648571.pdf In PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/77547754095.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/4kbb4o6jdukmom5l93lf5givme/23745126639.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9416983ebfb9925c42b199831cf230c1/93030192885.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/nbu8d3uj96m8ilqh6e290v94mo/79983787970.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/614dc0b63e755735844f1b0daf7cc3a2/66094968591.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b83e4648e---vulufir.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195e15266d---8024256113.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef7fa904d---3274644958.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/kegebi.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/niwipu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd8945731---lavufidanejogabo.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/80084322470.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/nigupowepamaxu.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3283df5d---75391104868.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/29032633348.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95697450817.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/68771662110.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/5161660786.pdfIn PDF document text
    • http://freetds.net/userfiles/file/12127580667.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9660c1dcc---zusozebifarizexodupumuned.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/84a367f3e5640590e7a7df0aa707667a/lowalutojufozukoliletakef.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/44473711060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chadta+suraj+dheere+dheere+wikipediaPDF 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_off000130c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D7 16588 bytes
SHA-256: 9caf12f57a0271cafa5382bda0d437ac83672668b5605945ce4bddb3dd58ee11
font_02_sfnt_off00017372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17372 10660 bytes
SHA-256: c86297b59d40825398578266b4e74470b2be11afe6cc7969ef207dadeb749937

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