Malicious PDF — malware analysis report

Static analysis result for SHA-256 103b6d23099205f4…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 20:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68f70fc2cce018243117fa47901c33ee SHA-1: be3a1eadcef2e00aa251343462664c839bded83d SHA-256: 103b6d23099205f427226587376c48bbb225dfe9ed86b99aabaf53605c5a3d11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wittlich-luexem.de/userfiles/file/vigeruxad.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea3d07550---83628317393.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dbb436fc88facffea9431da73bf4f4f0/zidirimufanejomod.pdf
    • http://lhsclassof68.com/clients/73441/File/11187718978.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608615fea1022---jometasixasabuduroxibob.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/fabupitelegevukas.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4ee74c326835f79ef495a7b9fe465625/jasemobuwerivolerute.pdf
    • https://mimpishio1bet.net/contents//files/kakefepipefedikojuwesebew.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6c9ca92b859fa131ea8fd4138d06bd0a/nadigezalodawixiped.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe133777---jimitiserowa.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/f067f94875332ced3a2b1dbc2ccdc2cb/jawowemetemujufukox.pdf
    • https://alternatifhosting.com/calisma2/files/uploads/womuzatokojuxajatunenokon.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16070dccf814ee---70737546962.pdf
    • https://alakharia.com/public_html/userfiles/file/88489108093.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56746d35---28903415428.pdf
    • https://reitinguok.lt/userfiles/file/5613538215.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609875150b7e7---wegin.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b564cea0e---legexojiroz.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0c6690c4139b5ab421b9b55dc565fce6/76402564425.pdf
    • http://buddhavehicle.com/userfiles/file/7246212653.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/5aj00uv8ivqdl5vi88nag2lhjr/30848295483.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e84087f3b2---dekubotuwadetoros.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mystery+elements+worksheet+answers
    • 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_off0000ed2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 16792 bytes
font_01_sfnt_off00010544.bin
ba0753ee48dc24c7fd45c8341f86278dd3c0a22272f0992f84c6f94629d978b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 10568 bytes
font_02_sfnt_off00011d48.bin
5dee46783da4b0e0ee5f0dafdb3aa2b81fce4d39db07717b57e313c58155ed43
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16656 bytes