Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afcc365cfa91ec0…

MALICIOUS

PDF

69.8 KB Created: 2021-09-03 05:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cbec2d495a56c50371b79c0f443af49 SHA-1: 26a5d8f9d67d0de82d9ba643e5e957eed85b35fe SHA-256: 3afcc365cfa91ec026a3135597bb30a74d36cf0c052ed211de5c86fafa596f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves embedded JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q04tnbu9k9tqm7apb15ro448i6/58312682988.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161147f5e80853---51890598281.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0111b619ae90d4cd09afeac83097cef4/poxonugoparofikobeweto.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sedizozavogamideragi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b96605e84a7d49abd3ce3228e324d85/41438024073.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cf26de70cd3ecf4deeb8d3990a861dc5/39053332479.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/1hvmt1ltshpgbkpu10mtbeusuj/murijijenagen.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/wolaxivigibejetonuv.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/35681278433.pdfIn PDF document text
    • http://stroi-sistema.ru/img/tabomumoginidolotava.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/mazenegokojuruf.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb8u3fnd31603u84it0m4u0jat/nojozi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/lenididulatapakadabip.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b7b6b9395---38079565887.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/14137551610.pdfIn PDF document text
    • http://dmkert.hu/files/file/pibusadajovifevefuvamo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/63017984224.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c685ac38e59---jemabugogirujusapawimib.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113524b57630---suvogokuxanikirubevanesoz.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/80610680810.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/97199174940.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/takikuvuxorun.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xoxezovanog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=quadratic+inequalities+practice+pdfPDF 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_off0000b28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28A 10796 bytes
SHA-256: c0e16ea0964ddaa5915140ce46135081397ca6b061c599ff2ff0425b2f52bfd9
font_01_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 15120 bytes
SHA-256: 4b7f2b8a5d02b1dd16c460f92a63daf5d0ca80b345d56a44993f6f8274b2378e
font_02_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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