Malicious PDF — malware analysis report

Static analysis result for SHA-256 064349a8dce2ceb6…

MALICIOUS

PDF

82.1 KB Created: 2021-08-17 07:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb39413cb81d79cf7e0b2fee1ac785dd SHA-1: cb03b0e71d354ab546ab959bb7c48c620cf4e64c SHA-256: 064349a8dce2ceb6dbc4da11ee673c5178b1ca7d4344e0ef20ab4ec3d056e519
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs, many of which are hosted on potentially compromised or disposable domains. Heuristics indicate a high likelihood of malicious intent, with ClamAV specifically detecting it as 'Pdf.Phishing.Trojan'. The document body is unreadable, but the presence of multiple external links and the ML classifier's output strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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
  • 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://alutat.com/data/file/sanuterur.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/89288152650.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ch9ovlvkeuvpdv86nrihod3gj9/27503184247.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/46854889421.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/61939275080.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/j48d9mji27gd6cfo32dqhcnee5/pidupofejisasirirute.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/firavi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/b1e34fc31ccc05867cf8e8579934a6f2/midumov.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768d3be0421---leguviz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c5216a373770c099ac226fc5c2de9222/50166895419.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nur7t7mvq1hs1lcct4fjnnq416/ximofi.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0ced80ba2---20711297411.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/62912581139.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b78dbb80---44800974174.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2cg1m92a7bbhs8u4g7kel31rgo/39353499070.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3a14bd06---4913620088.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9df9fb80---wifokexilolupakiregip.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/3601882728.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///waremaxujeraxenumudo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a41dce97---49732327573.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/24333767806.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/90753131424.pdfIn PDF document text
    • https://bataretak.com/img/files/file/sofas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+reset+smart+braceletPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10412 bytes
SHA-256: b7f1da6ce85f65f71e289c8929fa05c1a56c454ed90124e49c02aea3955f67c7
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 16972 bytes
SHA-256: a84e9cfb1e78796dac07ea1326da800e53da7b17525c82a050097e77dd38fa1a
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13337 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13

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