Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6f66e5de21e234…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 19:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc03576c86bc98d23d0b7b0474d0312d SHA-1: b6929d5a1df0dd57c085c226fd9bd6287010a82c SHA-256: ce6f66e5de21e2349b2d576e5e99763b0a80750221ac6d246ff3ba46eb6b4b47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs and embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The presence of these links indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=postgres+create+database+if+not+exists PDF link annotation
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/af06e37acc60c39214e96f966b53c10c/64160357264.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d690197f---fixejijasevuxejosugo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/71741511353.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/vizagavutafixelogemodi.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608009fd0082f---bozafefonogeb.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/k2prvgik6cv39o4ba5v9s5m8p9/duvipoto.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c960f6e0cc---8708791875.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/91028880147.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7ec22d92---72018696287.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/udff9hnshu9kfoqr6dkbcsj59a/50947224863.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/71929160710.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/183c82952138bb6fa4916f7d6a878b65/dibopebejalagezu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/2208399674f6995518d1f5146c85909b/bijulekuraraxotu.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3767d1ab---wamefeparojanarezekufar.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/dibigim.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/85598642239.pdfIn PDF document text
    • http://rayer.cn/d/files/kaveretexosobepe.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/jolebajebuvenagetasirudam.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/ca53b0854fa8fdb6888792f8a0f6982f/71613827063.pdfIn PDF document text
    • http://splogservice.ru/content/file/wukudexivejifal.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7863c59e49---wudipe.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4c5ab0db2---32295087949.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/j75aamugmftiaq4j4nvn1fnlnv/12111542722.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a1ff0784---mowitebivunajiridalunaki.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_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 10848 bytes
SHA-256: bafaee2c9fe34a388555052c8c8cb6cc7fae2384946fa12f017973417f311c47
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 17564 bytes
SHA-256: c630df4eb3e99a352cc39677246dfc6502e961357c03b6390f5eb35066b6ccdf
font_02_sfnt_off000139f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1