Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15771ed2f3f5813…

MALICIOUS

PDF

86.9 KB Created: 2021-09-06 13:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 845543cf5bb3bf80c6b214eb200cc4ea SHA-1: 5026c46c87d60372b171e8e746bd1fd159e91fb1 SHA-256: c15771ed2f3f58130e3cad9c4993575f537534e2eb5e8a0e68a204a66ab2178a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to URLs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kleiberit.ru/files/file/mifigewu.pdf In PDF document text
    • https://zaragozadenoche.es/upload/files/sinilotinonena.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/92790662956.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1cbff6615961c3f0e3e287d91042f8c1/peteni.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/841382183.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/xakatovatusokodarobafin.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/6ocd6njfms982duol6nravim9h/komojirufogokerepubeme.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160884607ea18d---47376521355.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/52028837161.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607588d4ca35f---sigaridosif.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/94941341230.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9f4b2f7678c060f3f2584e5667fb28e3/87196385940.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52399866154.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3425be1dafee7673f95a9c67992f2aca/35554370876.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f398290da27c99394b47dfa4cce09d3c/81060377751.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/ziboxogazewubopufip.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/26cb43474f4e0ce35d9b0885da0e0bff/79545031534.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/51579771532.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/kekopopa.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/8354499649.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/kegubumu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2dc0619ba94d33db4e15d04771293c41/3314330068.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612cee7a6acf7---57557265948.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/kipaxakafemuwo.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/lokomuropulivafarigid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=knee+exercises+pdf+kaiserPDF 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_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 19204 bytes
SHA-256: 3f21a5f88f098c1397e6875f44a150ed934148f126c2855e09d9a61cbf6f78de
font_01_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 10532 bytes
SHA-256: 22653da76511cddf051b9b69bf0ebf7a7c72f17a72ba34cfad1f59f44e92fc6a