Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7f4002cfbbc93e…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 19:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4698474f5de88f1c2411c4a3363bbd80 SHA-1: f94e7dcc28b3fab6d496805ab572a0a7485e7f7c SHA-256: 1c7f4002cfbbc93e14c9c7d65a3067bbf06ec24ecbb47b715a677503dbcc4542
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the nature of the heuristics point towards a phishing or malware delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=user+manual+format+technical+writing
    • https://mednet.mk/public_html/upload/userfiles/file/rubojuluwefoz.pdf
    • http://grupophi.es/uploads/files/nesava.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a303266b---totiwazuzuxeseneb.pdf
    • http://nedirajtebosnu.net/userfiles/file/18289619718.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3f5d704682d3ee2978379c3004b37756/nufakogid.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/6dnspkgj9gvf2dcmq0sd4dloh0/93572899871.pdf
    • http://goldartline.ua/userfiles/file/ranepesafoleresilegano.pdf
    • http://www.findvoters.com/userfiles/file/12282579848.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/saluzetisebetidipife.pdf
    • http://fueandhair.com/userfiles/files/segafevaronusedujezib.pdf
    • http://batiment-tunisie.com/userfiles/file/sawesetetojedoki.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/v3c7od09dknjjbk4g9ukrdb3db/losawewu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160708ce0b4538---xapobiwamatetaxiva.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e579a12bae---sowaposatiw.pdf
    • https://alajuusa.ee/media/contents/file/mazemixenetofusuparug.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210627104642140.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e2fb95f9---21406141533.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef199acd3---17355422692.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/875d681f170554985cb734f92dd4bb8d/kozirufasiguwebunu.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079085729938---begobedav.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097c5c16ee0f---23484968354.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_off0000e8a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 16792 bytes
font_01_sfnt_off000100bd.bin
603fbee251e8f2db3b520757db62b334605fb84da2e5a30a45c0fa3d98812a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10976 bytes
font_02_sfnt_off00011a18.bin
14b493dd4d7474bb76cccd964427915c45b767cfd3b2d73e6735d181517c9d91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 17608 bytes