Malicious PDF — malware analysis report

Static analysis result for SHA-256 3968fa763a8c6673…

MALICIOUS

PDF

164.8 KB Created: 2021-08-23 12:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e294ee248e69e8454a833b57f6a2a434 SHA-1: fca5c693cc03202b52487e6540c2e424eeebd1b5 SHA-256: 3968fa763a8c66732797f9d82efc7bc4c5214d9792141b875e27d1c83c43bff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, directing users to potentially compromised or disposable hosting sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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.
  • 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 http://richmediahouse.com/admin/uploads/file/76498028785.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942b8e6878c---87153227241.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/ropolexujapewutinow.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/mekomaliru.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087892f2c471---42983983394.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lefuw.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/natulilofutow.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/2084988225.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fuxijafaju.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/19077624801.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/36357005660.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/savovekidilevumekelemax.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a0de1adb---xijifulipitori.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/79697422640.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987973ba7b3---vozalemib.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/32689742523.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c5f908trom1vkjf5a4qldbpjta/tumapu.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d6baa72d---91585541386.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210520092312618859sy8nvc.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/klvbu12cvrm08l6qj53ejtr86u/lezekuviwekamijitoveziro.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/8584356630.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d57dc785---xipunekurex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=made+in+abyss+seriesPDF 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_off0001a2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2B3 17960 bytes
SHA-256: 8648a2203d8507e056123372728ece808f922e05cfa3aaf99b21e446a185bfe2
font_01_sfnt_off0001d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0E4 10224 bytes
SHA-256: 1662f6bd697e3e90d0359e9c6168206fedd5b78010179b55c1a57867c0d2e34f
font_02_sfnt_off0001e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFF8 48716 bytes
SHA-256: f65df44ac218d47343debbe2806ae44816825fb9146897829bda341387895b12