Malicious PDF — malware analysis report

Static analysis result for SHA-256 d632745ae18a6131…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 11:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 216d6d30b9638266b312d2a6a31a3bd3 SHA-1: fb29800653ef7626f157149a2b4038f802811270 SHA-256: d632745ae18a6131290fcc5cbc02a94aee8116f8fe5aba7cacf0ce10b987e7a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the 'invoice lure' heuristic indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://amigo-shop.105h.net/upload/files/julipifuzagubuvivuwus.pdf
    • http://teplorium.su/userfiles/file/lufasig.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hrqacjnuferihos2o53vc4q849/fixubajewuvososafezi.pdf
    • http://thienthaopc.com/upload/FCK/file/91208123443.pdf
    • https://dolupin.com/calisma2/files/uploads/gelovaxodik.pdf
    • http://htbestcomputer.com/media/ftp/file/19945301854.pdf
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/kuvesuligubabase.pdf
    • http://otczenacts.com/media/files/bopegodijibupagezizimes.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16145b63900cb1---pumimajobovigafupus.pdf
    • http://freewest.at/85180771432.pdf
    • http://poexali.org/static/image/_u/system/files/rulevuzo.pdf
    • http://bdsductri.com/upload/files/bofufasawuresomujip.pdf
    • https://hunde-katzen.at/soubory/jalukezonazigij.pdf
    • https://gulamanis.com/contents/files/50845307983.pdf
    • http://gaushalango.com/uploaded_files/userfiles/files/gixuguwiwamiwuwurunad.pdf
    • http://borneneskontor-landsforening.dk/userfiles/file/vojorodajev.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bffdc98f96---jididefuvedufidew.pdf
    • http://sapientgenerator.ru/files/userfiles/files/41208355389.pdf
    • http://warwick-ems.org/userfiles/file/97856717868.pdf
    • http://vasset.bg/userfiles/file/rebufegokobamigubin.pdf
    • http://allivecoat.com/userData/board/file/mevuburudame.pdf
    • http://thankschicken.com/uploads/files/xosaborapi.pdf
    • http://parmalab.it/userfiles/files/46453417241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=races+of+the+dragon+3.5
    • 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_off0000b181.bin
23a5eb4647651c9475375fee3d58b797e221db70cfe66a88df9072eb68bd73cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB181 11036 bytes
font_01_sfnt_off0000cb02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16792 bytes
font_02_sfnt_off0000e314.bin
656ecaff62f0d2c83ab37393b5b1632ae0ca14751d9f23a747764096bafcdfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 14944 bytes

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