Malicious PDF — malware analysis report

Static analysis result for SHA-256 436f576679186b7b…

MALICIOUS

PDF

170.8 KB Created: 2021-07-14 03:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdbeb0cbbb4fc70415f3cdbb04298002 SHA-1: 651a1e7c6afee629d397d650afee743d5b660abb SHA-256: 436f576679186b7b1df896f94096d7bdf7ac3841beb6b509705aec36b970ce89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9679

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 http://anthonyvienna.com/sites/default/files/file/rezokilisudivoguripobinim.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9b17b6bb---46465577629.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16080ccbaa90c1---42983273343.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098675d58e4a---fuvanivutugefabinu.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/61734320350.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c84053ba08---49266854781.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/diq7p8ausbcj5escnvc9i755o3/66440845934.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608866440a5ac---fojeb.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74d42500d---63892602494.pdf
    • http://didocrosby.com/imagenes/file/22307558353.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a7c152d5---butukefuwevafevitupaj.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/80050144524.pdf
    • https://eminencesolutions.in/resources/userfiles/file/loburarex.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2a6dc17c---zotiferadijoxupininemo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c67d15a117b---1116852042.pdf
    • http://karthikeyanjayaram.com/userfiles/file/pasademonebina.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0086a87f5---vepesul.pdf
    • https://peiitw.com/Upload/ckeditor/files/6109392398.pdf
    • http://reguitti-engineering.it/userfiles/files/nenurozodujifuwupeled.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/37458929649.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735e0d75d0a---tefusuz.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085af3068504---kusufapokusuniroxajanawas.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160befb4c85e76---vufidewefotaxo.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc23f13194---29554097422.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=to+the+power+of+negative+3
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21255 16792 bytes
font_01_sfnt_off00022a6c.bin
d15d58c4435a0e2fdaeed64c8c8879c355b31e880f3e4d57bb64ddf61e41fb07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22A6C 10708 bytes
font_02_sfnt_off00024313.bin
21e24b23b7ca482aac5ffc1d8b5fcfb068ea758e3b6ff0d2d58e7a7a01153320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24313 24620 bytes
font_03_sfnt_off000283ac.bin
c84868fca49ad2fd08281c2db0e4067300a8e70785bc6b58c2ce6bfb8f4c1c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x283AC 17324 bytes

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