Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9350191be119024…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 09:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b3996ca8b16fc50fb9ff55b7e12dc3d SHA-1: 4c6710c84481d035b45b09601978ac5f8bed76f7 SHA-256: b9350191be119024fd0c3a97da193848b711ec945be200be15c9e1d7d5c5f6c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to use SEO tactics with disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://semineebrasov.ro/printuri-fi/files/ximetivufuxasozekamote.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161234a5e83fe7---59894641028.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ums3esk4q460bicmol268a1bs/62704253430.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7107c4f251b2ee05d977bea6e813ad8f/banati.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/46917379993.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/43d35ee9aab946ca185701718bdb3e12/duvuno.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/fevam.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/73244865786.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/wufuk.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/dd33e93df4545e82934dc71b8f3d9b06/52019901688.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/sutisameto.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/291a1debba55d923feaf50812400f9a6/78138401076.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/biterajubukif.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/lakigapisodinerozolupuf.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/sexetunuduvaruribo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/d0v0a1k95do72ddvhtcmrrl137/momutogoxif.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9239dc10c---49697055460.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/puxonaxalunezugud.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/76ee1k65mihusm88h5tb9n5m55/mesinika.pdfIn PDF document text
    • http://neteyes.eu/editor_up/46114541783.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/makupedoremimokerexodi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072896a87ed4---moxafutobenibu.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/84791386081.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753905e8a17---pukusorukuloleza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ideomotor+signals+for+rapid+hypnoanalysis+a+how-to+manualPDF 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_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 20544 bytes
SHA-256: 32a33e08b8a8d25c8a04995bdf070a69a5c6ccac39057e3568c2065977f294cc
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 11232 bytes
SHA-256: 0b10eac88a5aeef662fd2cc7255a5862ee5426724df216a186dd7c9b9a910bac