Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5f1b70f070b6ea…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 14:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5b5c86fd2afded852e590282b1e57f9 SHA-1: d74d91e4041998830e6dec04a41efc0e27c1c3e9 SHA-256: ab5f1b70f070b6eab9525c52fede5007473f971c4cc3a789f222b51586c5c5b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Numerous URLs pointing to compromised WordPress sites and disposable hosting were extracted, suggesting an attempt to redirect users to malicious content. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=turn+off+talkback
    • http://topflexsports.com/uploads/pojugok.pdf
    • https://aymsoft.us/aym_image/files/juzirijudor.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/97495139018.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614391438d620---totefowobe.pdf
    • https://wmu24.ru/media/file/madoletep.pdf
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/kunapukitevo.pdf
    • https://anmoul.com/userfiles/file/93685536267.pdf
    • https://allegypttours.net/userfiles/files/48622211124.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16146afc64f45e---60617701697.pdf
    • http://ombs.ru/uploads/files/6457571343.pdf
    • http://gemwishrs.com/ckfinder/stones/files/xezofifefur.pdf
    • https://tiklatakip.com/calisma2/files/uploads/48448237454.pdf
    • http://xsjsbzrw.com/uploads/files/notipapavezaxefudafaxu.pdf
    • https://minipowerpack.net/upload/files/zakudogarowole.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210917050044_Z2VkYWtpamFnYWxheHV3dQ==.pdf
    • http://asckhn.com/acskhn/userfiles/file/tukilibaniz.pdf
    • http://billedbutikken.dk/articlefiles/file/tetulixig.pdf
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/22528151729.pdf
    • http://neapol-m.ru/usr/file/94437219809.pdf
    • http://spbmedax.ru/sites/default/files/uploads/84403115636.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141da7a5ca75---naxiburixodozuguxi.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_off0000b4b2.bin
726dcc0613db386b9735fe45a4c2e2442391ceb80f5184ced97d033f4c4e2793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 16648 bytes
font_01_sfnt_off0000df65.bin
22fc0b157803e3bfdc953e29a7b0c6358b993f5f18c8333d30221d0ec677038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10232 bytes
font_02_sfnt_off0000f689.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes

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