Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17efb0d79b3bcf5…

MALICIOUS

PDF

92.1 KB Created: 2021-07-14 01:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55d964069d5138b17e76364b14c0d0b2 SHA-1: 507275420e47e6cfc5111dc4ea6c09b89578f232 SHA-256: c17efb0d79b3bcf5ea876382f80e7801a37958d0e1b43271a3a0ebd59b69c1e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://alexhofford.com/temp/files/file/ribatipi.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ee2f08d01---gijosudikozodesokig.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581859cb1b---jegubekim.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5feab7d6---zufekalatatobiwasis.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8493f7b61c---89396772618.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ej211b3e5jj5s832gmqi0f2qeq/dikuwutusuwafigojow.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/46006252236.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd21c66c68---95810364511.pdf
    • http://tremonttemplemacon.com/clients/862779/File/sijeruxubezawuduwaxalem.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/jumukudek.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a720d9adab4---39272422582.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6c77cf88---juwoterigidatomivu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d87cf94e042ea0b70940d0bbf612f388/97817776377.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baca3e98fb4---44713707308.pdf
    • https://susta.vn/userfiles/file/xukikojodexat.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ca4c084e52ae62f7e4497902224f725/rowazuj.pdf
    • http://stensoproject.com/userfiles/files/13106221356.pdf
    • http://archi1919.com/smlclub-files/file/tidiwi.pdf
    • http://zjqzzx.com/uploadfile/file/2021062912500373499.pdf
    • http://radissonhoteltraining.com/userfiles/file/61706209533.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b3089abf---63797952735.pdf
    • http://allasclub.com/campannas/file/16523865009.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+great+judgement+day
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
font_01_sfnt_off00011fb5.bin
2d9901f7a7123b9feeb87c5f991c6dc882084dd0c5562621dd3d6323365c934a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB5 16776 bytes
font_02_sfnt_off00014b4f.bin
8b43f5a82ab48b984a1c00896bbabd94138ccc76ff57435ea0bae3fe97b10221
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4F 10576 bytes