Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f2c7cc366aca52…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 14:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c715e1abdd44170c83063af529f0cac SHA-1: 92ae78ecfaafe6b49698885aac81d1e5f337a136 SHA-256: 53f2c7cc366aca52eb3e21efdb473e32be5b8d93962db83b2c3c7ca2e23bdf57
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to deliver a malicious payload. The presence of a 'download button' lure and external URIs further supports a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=how+to+transfer+music+to+android PDF link annotation
    • http://antonellascarpittadesigner.it/userfiles/files/rogatuxogugebusofomuwuwo.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/79772218435.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a85383d5c---gaterudaxa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353f4e2d0d7---64840570631.pdfIn PDF document text
    • http://specialcats.nl/media/files/dujasopapufatixevepe.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/79384854308.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/23497376069.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/41301826246.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5a5386a75803d8dcd310fded27e28e10/34804060352.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/18635657040.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/genivomofupekivujudenan.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109071125578441.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dediro.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wazorajovovafojinibag.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/kozimusir.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7f42bfd4---zosip.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/75061283781.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161404e7836a85---19006069699.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109082001475281.pdfIn PDF document text
    • https://onecre.com/images/content/files/3371489630.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a81b75bc---wadafi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379ef88e9a5---jikefalesajawamalavala.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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 10768 bytes
SHA-256: 36ce21a0b44d9ecb9a5524efbaf852fc6796b7a80ef971d71ff28e511e0aa064
font_02_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 17960 bytes
SHA-256: 710174a7e1a7c01ccc9ec4250d6a104f071bd57d0fa8610e0b461ec9da6e9701

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