Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60126ac81d8cf93…

MALICIOUS

PDF

77.3 KB Created: 2021-09-23 16:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b8e8f957c3c433c110678bda434a3c2 SHA-1: b227c9c8f5c54d6f9b9bdf0258aac73fcfc7b665 SHA-256: a60126ac81d8cf93807ac376032928ee7f08e667abd052ae8305e40742c26d3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript potentially being used to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=space+rangers+hd+cheats PDF link annotation
    • https://www.alitec.es/js/ckfinder/userfiles/files/4020590315.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/kipadavifadaxolukafimid.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kefezox.pdfIn PDF document text
    • http://anpo.vn/upload/files/tupijematefi.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/linonikorumox.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/refelikebutajuleves.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/15056940867.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/12986360900.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149bd2bf3866---bubokegiwexesesena.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/92f3a67fbd5c4fa88560569cec81357f/tabilonisa.pdfIn PDF document text
    • https://tebra.si/userfiles/file/mosefaxutapu.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/dixupovodakot.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dolobesotugotuture.pdfIn PDF document text
    • https://tipresentoio.it/images/file/38496912241.pdfIn PDF document text
    • http://phfamilyrestaurant.com/uploads/files/pidekadubuvenimilivifiku.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/bubap.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/godigufi.pdfIn PDF document text
    • http://chirineli.com/img/lib/file/mewuduvigidabofawo.pdfIn PDF document text
    • http://fteq.ru/files/file/bugixepadatoximod.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/bixefasomatuxixiri.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e1236ad0150c265dc9a70d01202278d6/41783586635.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/nofisojorafewigifewuz.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/64389363147.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_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 10612 bytes
SHA-256: 0d3690e7b1988eaa5c745322031658f7aa1a7edf2a5fc65d22b7ee73999af2d2
font_01_sfnt_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 18252 bytes
SHA-256: e543cee442d940d762af1a738a6380c7311e65b4b2bf64e74ebdf0f5fd3fc762
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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