Malicious PDF — malware analysis report

Static analysis result for SHA-256 c529e3e52c8be23b…

MALICIOUS

PDF

78.8 KB Created: 2021-07-04 16:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60911863add38857b27977abfa4bf252 SHA-1: 4720e85345709c51db7bde9cf245843c324bbf6a SHA-256: c529e3e52c8be23b03a7cdc9ec95fe43ba1c84e00dd48c88a01268d2ba61b008
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and other potentially malicious URLs. The presence of numerous external URIs and link farm indicators suggests the primary goal is to redirect users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/gujarumuzimiloxunufapije.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3l86mv2pcgiel4qn13l8q0qe3/fokitin.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a793a23d8be.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609895dc9b88a---7790049852.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160808a720b8bf---wepimitewojefomekinet.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/o8u7p2uj56vuvt2gu7iveb88l2/togumabenojezifizetebi.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d72891ec---fenozesubipexedabakas.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076912060cb0---66727125584.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e5795e09e---xunelutenanelamumujoku.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b10f186456---wakejejibiruferixeteleko.pdf
    • https://sieuthimaytinhcu.vn/upload/files/63197725761.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e59642bc---solunaxubajidaw.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/08a46e30e7ba2f9e6251bc81a023959a/43370031398.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/7552dc27aedf4ee82d16130defea8132/dapegaxoki.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b249a877d8456a7c8c71928839c01305/sofok.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160846fbc741b0---89731120347.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/84026744891.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9534e2885---dobas.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/fetasumubojenarat.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6eedc4e4---rasorowa.pdf
    • https://stopserv.ru/files/file/wajirus.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e0afa4f45eddbb9ff1ca7aeaaf1ce43b/86648134571.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075225c550ff---90283760146.pdf
    • http://aczelzalog.hu/tmp/94271668588.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=radial+nerve+flossing+exercises+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_off0000d1c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 16792 bytes
font_01_sfnt_off0000e9db.bin
081196ae40619c3c5b5745416f2cf78fbd5dacb2db1b8b49f054f88567c9fa72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 16012 bytes
font_02_sfnt_off00011308.bin
2d0e7f1176426a979a5e0e2967163070a600ae9a01c919df0d7f0d187671802a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 10912 bytes

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