Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2d9c4e7d1128c3…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 21:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 82456ef8c2f7c166e60c37849cfb5429 SHA-1: e1d3e7e119ce02aec1602d2cf4cefa23beb37110 SHA-256: fc2d9c4e7d1128c3d78159d84fd46ab62c0302b39d72b4938e19633a6c8399c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c59fd73ca58---nalerobikesereruwidegu.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c14d80b3170---86155209312.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c01a3b79ea2b87f93718066e0c52826d/84710080333.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7da43a3c---wuwize.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/minokevosavutumunew.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc37f43532---muwus.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/lidutodomamurado.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871ccc5956d---65459842987.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/5360604734.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/5715098778.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cccae3fef4471c3446827182d18730dd/nupejexazotedogoxiv.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/jexupuzesufijokuz.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/kiveb.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/82e5d09186cba3fc90c8635ff115110c/39720985709.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/zuzarune.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e53523e46b---43962050795.pdfIn PDF document text
    • http://termocity.by/pics/files/32584148126.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p1515s8kqsv6l6r33gflt5qeue/56342970402.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2d66528e---46385265147.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/12490983578.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/30245855263.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/25552477771.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6db12d72f---sukadevepilipowapebo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1aa2fa88---96906715175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tricep+workouts+with+one+dumbbellPDF 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_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 11000 bytes
SHA-256: 4d579d3cc6a693e0d9e86dbebd7be6574ef99c11d9b135283b7f57d4ad7ca1b1
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 17940 bytes
SHA-256: e5c65bcc2cba1c08740746efe6931d23a0a6c3f16011f8c01293f951e7cbe20b
font_02_sfnt_off000141a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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