Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e2f03723416ff5…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 17:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29cf7801f2006efc54117acddcaee2eb SHA-1: c443015c804c4076fc95fd9f8ff46ede9f5fe8b0 SHA-256: a7e2f03723416ff5857efed604b4f71abccd453a709a5d8ad369a3be56782d93
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to other PDFs hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8d18f999---94075743518.pdf
    • http://ranjitabiswas.com/userfiles/files/wotedujavugonivekutumati.pdf
    • http://angerdress.store/ckfinder/userfiles/files/kamigipitifoz.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/fa16a2a293bca59703dc59db3a8ec596/21670722712.pdf
    • http://ducthoaudio.com/upload/files/dofetoliwodifoxegab.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c191643f09f---sebuwukagidevig.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/32522958039.pdf
    • https://keluargamimpi2.com/contents//files/besajosudatad.pdf
    • https://travelstore.tn/userfiles/file/55233543633.pdf
    • http://k-souz.com/userfiles/file/zexasorotoretop.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c096f41ba23---77763672230.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/48b3b0c2e5bff3563f61a33caf345e24/wofebagavimovubobow.pdf
    • https://aradovan.com/userfiles/file/loxokerolidusuwe.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7553c2879f---9086994358.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3b7afda3d944887f592cc0f8585047ba/90615910042.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=php+check+if+string+contains+numbers
    • 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_off0000cbd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16792 bytes
font_01_sfnt_off0000e3ee.bin
844cedfdc9b3a6e61f685f086798d9ccff107273de5b11719c42f3cdc512c68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 11216 bytes
font_02_sfnt_off0000fddc.bin
a17849e10e2c52bf668af51521a708bcb7ba1275b4e4d10d786a2d3e9b6b0467		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDC 22432 bytes

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