Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64593a67c5d3756…

MALICIOUS

PDF

214.6 KB Created: 2021-06-30 08:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57900dd90d03602b1af919284a453329 SHA-1: 42ab91003afd84c8f5bbef5f7ecea1b659679554 SHA-256: b64593a67c5d37567c5392c9f9e989adbc72bc95ccdb0807d58d1c02895e4fe1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, indicating the document likely contains urgent language to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://osoboebludo.com/ckfinder/userfiles/files/56581240609.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cd2819eb210c24817f76ba2a67dd382b/57021525159.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/04b1da402b08735273b11b4271d41573/29336761821.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/vuvitumokizugubupefus.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dp2g4p1men8jos4nsl9j14aqo6/jilagagolemaf.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/rakumiz.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tigadivelawaniwezalari.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec85e4009---99200383550.pdfIn PDF document text
    • http://pneusmarene.it/images/file/relulagot.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tst4s30084i57u0etii43kkuoh/muvajemijujije.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7692c6c6cc5ef0756594002fbf73afeb/pexuvejumilomawipof.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/moguxibironunasu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2b01efa7psaiksko2dg7um6tte/limixoj.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/66128169411.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/pebokidukibibanasebo.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/71d75bf3dd091e581508febe707a12ee/rajepolofar.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/51744280944.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/15a2c3323b05615559bfef4191d6fd98/gajururabogeluje.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/dde6ffe31b66507ad07b444bad814118/92268371070.pdfIn PDF document text
    • https://hojoairport.com/images/file/zogurovabawimizotasagegi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a074758ea5c---susoroxukilugebozipopig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=in+my+life+tab+fingerstylePDF 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_off0002ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED5D 10644 bytes
SHA-256: b4784018fc4b56a40e35d953147c7c74d799721ff5467a1f84365a58b19c0e08
font_01_sfnt_off000305b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305B0 18236 bytes
SHA-256: d638c4d4f0fd0154ab7fa11f16aa9cac8030bd73a3986668292bf9d534c23ad1
font_02_sfnt_off00033527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1