Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb94b91724b30c54…

MALICIOUS

PDF

94.0 KB Created: 2021-07-16 18:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38c7f91ddec07b5334618d828c653fd5 SHA-1: 84c1a6cdecaa1f5ee386718d89399592e93b9554 SHA-256: cb94b91724b30c54ded24b29f4f0cf3e7a817c2442d6cf96063a71cd4f3ade1e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external URIs and link farm heuristics, suggesting its primary purpose is to redirect users to potentially compromised or malicious websites. The presence of multiple links pointing to WordPress upload directories further supports this, as these are often abused for hosting malware.

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ben9kktgtupnhfbooepff71326/suniname.pdf
    • http://coreaad.com/DreamDataUpload/file/subesonobinig.pdf
    • https://cicadit.ro/UserFiles/file/xajilafin.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62940620c5---gunomemo.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lnj4jrn9mqb092l85odf2sqvj0/vopegitejokadavexusanoxu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc133f446---wobitodose.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/11e47460a9943fe049f55565ec88fb1a/78311737741.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d3ce5d971e37a524d2c8a9d2fc36d1ec/99687250817.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff566be733---mopud.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef5236cc2762287a8e5edc1664ceac5c/47014797767.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b1aec7432---30304523252.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc3cca07f8---boniwexarumupudo.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d23633b9---kedup.pdf
    • http://industrialdevices.in/uploads/dikex.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/b6b98q8mccui9b4iiepgiagmlp/7204453664.pdf
    • https://avigailpekelman.com/sites/default/files/file/10500342426.pdf
    • http://amghanoi.com/images/ckeditor/files/17372857189.pdf
    • https://netiko.ge/img/Data/file/8693494279.pdf
    • http://polishingmarblefloor.it/userfiles/files/dekefirenunonamowi.pdf
    • http://vladjurnalist.ru/archive/file/ziworurisipatiwo.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3c30524---6956557601.pdf
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/26958531375.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/86653fd993480ba82e6850f2027d120d/73992932775.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096a94e59493---garotam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=loan+amortization+schedule+excel+with+extra+payments+and+escrow
    • 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_off00010b95.bin
9b6868a3dc7596160e3d0bc65e0e068b7e6f1a0a7381edcdea4d84ec592945cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16944 bytes
font_01_sfnt_off000137d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D5 16792 bytes
font_02_sfnt_off00014fec.bin
9ca5045e7c0bd24b42c6f7372821f626ec9b8f369a8b5b37601efd932b71b148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEC 11200 bytes

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