Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd8f9cef4fd6ea8…

MALICIOUS

PDF

89.7 KB Created: 2021-07-13 07:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01f0368592898bf538b856c42f567b8a SHA-1: 3d64eb04756fb5dde24e1bf4589a453c306b9307 SHA-256: cfd8f9cef4fd6ea842d273556f0ae9f36820cc36cf225a8b5636c7ac652fa7d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the numerous external URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The document likely aims to trick the user into downloading a secondary payload, potentially disguised as an invoice or payment confirmation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://drafthe.ru/uplcv?utm_term=supplies+on+hand+adjusting+entry+example PDF link annotation
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba446e6f4---95058438071.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/81228457877.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/63d3ghjutq78ksfjmdvr2e8hj7/4432012933.pdfIn PDF document text
    • https://papiratisk.cz/soubory/91898505385.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fda47e74c---28586748063.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/pajepebemoj.pdfIn PDF document text
    • https://lecachet.fr/docs/files/51673516637.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d22ed00cfaf58090b12b40de69067689/35045056063.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pexonutakozapujufude.pdfIn PDF document text
    • http://stylekd.ru/files/63050419601.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/99214535718.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sexetugidogo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e2d243f80f42bd56436d21d5165b537e/68820518707.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/eruc0iuqnvaf179d4950btj55o/6869297912.pdfIn PDF document text
    • http://temple.mo/userfiles/file/ludojinoko.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e516fb9b2a---4572533838.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/36568f4c94cc768650cf91744e56cd9e/81580295810.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/adff21e521fcf1a3827d04e9ae691992/63035018817.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/lazipexefelumegilas.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a238f223b98---10653308088.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb471065bf---xilisolesuvuw.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvt8roidq69hogp77me8n7e4l8/wipuveviwobagifelepevu.pdfIn PDF document text
    • http://ballard1966.com/clients/22636/File/80083150235.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59e31e6fe8---94062058410.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8c4a80778879f0c63030647a54203057/82723742270.pdfIn PDF document text
    • 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_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 17540 bytes
SHA-256: b338a1d77554ff8c65052ee67be3ab72cfd0c2acd9d6b5b1769a5c6a2c0ac072
font_02_sfnt_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 11360 bytes
SHA-256: c86b7a15489a151a7b25b8bfd88dfd39314da6f4dbcfad49c0da0658fd49b3a3