Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa339c3c172473ae…

MALICIOUS

PDF

92.2 KB Created: 2021-07-14 01:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3ea9f3d64101c05d1b373a16bf581599 SHA-1: 3a104ac234916341b4e0314042cb819a2a043c9f SHA-256: aa339c3c172473aef0c8b61e9975d39e7fccd510d4ada252f920991e591ccad0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a trojan or phishing-related document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1ed365e08679164885334bfc5079d416/riken.pdf In PDF document text
    • https://fajndoktor.cz/images/file/files/62664482877.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/3gf5so5sv32kr1dr9bjt9ke9bs/batiravetokepevuduw.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210610143235.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9ebfe994d84a1492136db5b9850f5d0f/refutajekanisodizedo.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/82922533980.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26168835647.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab84b7553cd1e874180e698335c23254/63012015498.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/l1fqkm1pvlk6667vr3hcr4h2g5/zadazajijefuxifaxovoz.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/7cacf5cd5297620f60182e65a611a43d/29410791580.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075add606a17---76075194299.pdfIn PDF document text
    • https://anfauglir.com/images/file/gifix.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/ace075985e05331e72a6dc5223c2619c/jezezarevoke.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca3da77d29---52359878388.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/fakok.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/afabd60375e98504dd6a1b940b8e64d2/vomazevurumub.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/28543120820.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/icqge1u35alf5vfpc0ukmd806d/95536980676.pdfIn PDF document text
    • http://webbuilders.com/files/file/wuvalet.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/da9f61ae4482715d65a6938f3c5fed6d/talabu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l2diflbp23l6vj6j5l01b0dhmm/98113290174.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d4132ca839a818dca224bd527c044de/5777051776.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/79974202247.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/96f5lhg4t3rkirh9odd8cubh4k/kosabavekukexojadit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+convert+several+pdfs+into+onePDF 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_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 10756 bytes
SHA-256: d63834c1ba0ae84b82a85ad7ec3c263abd6b5a5a595401ccd5c347628d6cd3ee
font_01_sfnt_off00011f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 17068 bytes
SHA-256: 924d00c79b9141c129340cd476949b359a14e181e4bc0303c928dec165d28e22
font_02_sfnt_off00014b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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