Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e50220629bae86b…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 01:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7333aeb95c943081cb787f9cb1f0cb8a SHA-1: 26d194937ae4ea80221c7623c7bb79e6120189d7 SHA-256: 2e50220629bae86b765c7111965a28ba36a4ce4229e84929bbec509e20aa47ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. These links are likely used to distribute phishing content or malware, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=numerator+definition+for+kids
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079967342451---foturumanuv.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce095817511---kumenaxirod.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3931c8aabe364c4e824bf48c5fe3510d/52542583342.pdf
    • http://garmagostaran.com/Upload/file/jotajizuxikuxekediketote.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/98c36f23e06709c91fb0ee7c922b25c7/59162724187.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b47957990---52741613286.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9cf7193851a39a49e80e54d1b9a290e8/85292841110.pdf
    • http://adabaskimerkezi.com/upload/file/wutokixisitikufebofet.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4a2300e2d654ff91098220207dbe89/25620707329.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b33d9a2d1---tiporasurelopumagokiri.pdf
    • https://napraforgohotel.hu/upload/file/sazinegekup.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qb6mqkv967i7m0t7cbdp720e2o/91615668991.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa615501f6---jarabozeninepin.pdf
    • https://dichvumayphoto.vn/webroot/img/files/240882450.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vqndlgbd92begp47p8j5o4mla1/nisemugavavifolanoxikix.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6h14pdimf85b6nisunignp7tsf/kemetulukezitedejekijez.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a952ceba7---zezekojumowetulujimo.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/617b7e4s7ops87vh8v6akjqpn5/11838693578.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ved05hjonn3mm9ce64mpqksmdb/vuwobezawizuliki.pdf
    • https://victorybear-info.com/userfiles/files/fanotib.pdf
    • http://attlas.center/userfiles/file/pufelobojegijogijijusi.pdf
    • http://aweibel.com/Photo/file/43617760825.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a25d2b8a53c549b69d4e695abe787ee5/juzireva.pdf
    • http://lelit.nl/app/webroot/files/userfiles/files/98984405943.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_off00010d43.bin
59d25ff63ee6ab4134587f6601c897c92f86a413044316fc2eaa81b9b3075d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 10640 bytes
font_01_sfnt_off0001259c.bin
aad6fe1acae058c8046d4b6cb1d397693ad31acff49c7fcbb3c1c41b3a8ab5fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 16956 bytes
font_02_sfnt_off000151fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151FE 16792 bytes

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