Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1585e961e38e174…

MALICIOUS

PDF

87.4 KB Created: 2021-07-08 09:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91896e6c56941fa9ccf7b823ea17438d SHA-1: 493a9af00bcda5a8af84f522fa9fe69f20b34936 SHA-256: c1585e961e38e174f68a80fa544c0ebfa5b1fd1bfc41c862e30c05c4abb3fab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d2d934d9f---11400709537.pdf
    • http://soflacops.com/clients/83266/File/61036566502.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b663e2ca---75067164247.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc3e9346f---8159910194.pdf
    • https://unique-u.biz/images/uploads/file/levezimaxanabilopa.pdf
    • http://maskaevlawyer.ru/userfiles/file/kalux.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821d2d47761---duwigofeliz.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/un3ltsij2ovj81a28qkeg5iabd/20571937845.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160e6902755602---52441242715.pdf
    • http://www.aluvascientific.com/UserFiles/file/gopevorakubarowivamilesib.pdf
    • https://shopabrang.com/images/files/lerezilerivuxufuwilofotag.pdf
    • https://foodphotoshop.com/userfiles/files/kewuni.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093faf7274e2---towifidekojetanerebe.pdf
    • http://absolutelyneon.com/userfiles/file/lewajalufebezaturu.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/fa86k2tsfji0kshrb3ur3hhudl/77210881964.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/43992606048.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0bf9f3fd---guvif.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0d81d5dee018dcb4685c5403aceed6c6/88897989847.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d2e790d58---95893913748.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a567443e736---76895153993.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085b71f2257f---munukisewukaxupi.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e94b5992b6e449ed8c31d18e9fdf7eca/puzufekadupomevanoxobe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vocabulary+start+with+a
    • 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_off0000f5a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16792 bytes
font_01_sfnt_off00010db9.bin
3be7341c77181c8e63f3f8f4cdc517b88f8fbc44c77ab91050ce874eb56f2246
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB9 10500 bytes
font_02_sfnt_off000125d5.bin
8e714f46b2581583f68a39420259c3256f0a3eed1fff0b08e8b3383d9ccbb009
pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16556 bytes