Malicious PDF — malware analysis report

Static analysis result for SHA-256 767b369b7e01ef53…

MALICIOUS

PDF

83.9 KB Created: 2021-06-26 01:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b33c761ab19db573fcec668bd3d3ee7 SHA-1: 63daea081751641bd7359bae9ee5df07721e4f30 SHA-256: 767b369b7e01ef53b973bcaaa1cb03caacadb2826c27dd4242c322a225558a88
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm is a common tactic for distributing malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://krisoc.ru/uplcv?utm_term=to+be+in+a+fix
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/d74bj5pfhm7bvrg00hoi496fo9/49558034468.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/jinunitaba.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/69568272799.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bkthsdcvsv9jp68r3f8qp9g37q/jujosowobikuwor.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/v5180rbkrdeisj672787kr6f37/19754947793.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbce49986ee6d54fff5967c7aa43c4ff/zifutikuxupijuzilamunilix.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ede30f6632eb436d3708de2b392dbb1c/45238206194.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8aaefd1142bbedc8ce2e83f87258f05/wodup.pdf
    • https://nnkcreations.com/userfiles/file/89880092576.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee9b557ace---85565397010.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/42f2c7bc52aabc634a2b4e5efa09cd5c/xazidevu.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/lebubujonupa.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zenejepagef.pdf
    • https://rimsball.com/ckfinder/userfiles/files/wulilivivexejetopo.pdf
    • http://cravaluos.com/ckfinder/userfiles/files/salemasuwepetet.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fb25e7b4b673caf88cae00f9508af607/boxobigavoxetaxifew.pdf
    • http://aite-materials.com/upfiles/file/79404534575.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/larufqpmsaifen2mdfi5i9dpm1/godobenexomoferofisanis.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63b5392a5---dozeteminibukejokuloniji.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3ba0230f---filikewufefonobowax.pdf
    • https://raiporjai.com/piceditor/file/migobuzevusijase.pdf
    • http://jjmcp.jp/userfiles/Image/file/bogetukofizakowilugudapal.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/97601936588.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9b7f476a267eba314c09ac713b7d3311/79999496601.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/74050d17c7fb95977bb681cc1a798f40/1181751873.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/86635c8eb728ecedcfe318ed990d7f6a/zafimubonek.pdf
    • https://viboot.com/ckfinder/userfiles/files/nigupotu.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_off0000e8dc.bin
2714cd1798b871413be54fb97d3b9596e1cf2870d91e803ba024653b7d3c30c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DC 16608 bytes
font_01_sfnt_off0001140e.bin
12a506640aed06221e1ab7d4c4a32c819beff471532ccded94f4184471a55fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 10000 bytes
font_02_sfnt_off00012a5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 16792 bytes

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