Malicious PDF — malware analysis report

Static analysis result for SHA-256 5673636a730bb659…

MALICIOUS

PDF

76.6 KB Created: 2021-06-26 08:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d40cdb767550279b739ef5bac82a5146 SHA-1: 5b47c9f08f74c2f27bc385f960e924df3fd5e836 SHA-256: 5673636a730bb659722754f49fe186c8f37b647087f9cea0f49da70e79161bad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://laborke.ru/uplcv?utm_term=iqro+online+pdf
    • http://prestopc.it/upload/file/jejoj.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f155fa9972---2715178862.pdf
    • https://arrayamed.com/userfiles/file/rofeniporafe.pdf
    • http://fouladsazanco.com/Upload/file/gofosagikopowumolu.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b685663678e---59185856065.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d536ddf82---94210987361.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/nkbqukrvh8lvet1omrhk003767/22446622241.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a965fd1650.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2gj2qc9m4ujr26rm0jg9q6ipm3/42462292895.pdf
    • https://tungqibiotech.com/upfiles/editor/files/fawim.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63088efcb4---rusejulu.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3a2748c4908091e3b621bfffc3983f65/50918531917.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf875577eb8---11361541347.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607804dc7b25c---dojodidopogewolufu.pdf
    • http://linkingpeople.info/userfiles/file/65558845786.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/goieclobi0696jk0et8nffhiju/36943938724.pdf
    • http://angelescare.com/userfiles/file/jatapogijulowo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c59af653f7b---75416710523.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b6e2d56d---42435698591.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb3983050---dixit.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4565509804ae49cfdb42fa33e4178c4d/97643793442.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/4c0037363b18df8ed64ea786f6cd2576/10887471980.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1d42c4446aece5a3edce67c4a64ee574/99291471226.pdf
    • http://cosyromania.com/media/file/50244687766.pdf
    • https://pellevah.com/upload/files/98341731973.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3f7c8c22---65598926073.pdf
    • 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_off0000ce05.bin
7e4cdd5c801f45581ca8b7cc0f3a3684589484d9d46ff465125e0f5e22e0204b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 10160 bytes
font_01_sfnt_off0000e47a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 16792 bytes
font_02_sfnt_off0000fc8c.bin
6cec32067731be7058c5aca4dd099727194d25ef398a9c78e2649451b66b7501
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16060 bytes