Malicious PDF — malware analysis report

Static analysis result for SHA-256 f339de6aecffe22b…

MALICIOUS

PDF

112.0 KB Created: 2021-06-26 08:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 023b080ff18cc89b66f2853ea7057f13 SHA-1: a898cbc624569fe5cc3898d9272ffcabdf813854 SHA-256: f339de6aecffe22ba0e6df0aaf7e3357e9e4cbc0399af45df3e5b84e60c4998f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d8946158---regorano.pdf, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a27d8946158---regorano.pdf
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/46098571255.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/gik2svu5hpn4f1mlqn2eheri75/51289812389.pdf
    • https://africanresearchcenter.com/userfiles/file/wuxumunodoruten.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c892c04e857---karipivuxabad.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/l3st56g8mipf98d365dcd1co8h/runijazelu.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/bea37e4120d996081a53cf680cbdab97/66985811830.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/ffc067aba1635c6289ea8c2b27ee1a9c/21659528327.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077337f208d4---33846612940.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/22f8a6fcd5b72962826cc6cf092f4e4e/fuxojetipalevugeginife.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddee7b6e34---lolefib.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b16762ab5a0---xeverirevofepujipap.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/76bd815c5de2b68d02fbacb91587bcff/36024442299.pdf
    • http://nowyhotelik.pl/userfiles/file/27094347406.pdf
    • http://pensionpoint.cz/userfiles/files/55169349872.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/39486159266.pdf
    • http://atomleasing.ru/media/File/tajorevikelanufawomerewub.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/605957754a096af10fa935e32eb98f39/2177323916.pdf
    • http://say-international.eu/userfiles/file/59808621681.pdf
    • http://www.vikingmaterials.com/img/sozumidufajuvonufuloxi.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0b2a8c17bfc386991f334b26ef84b5c1/41457318900.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/47a1a332d38a911241a2b8b0b1d9f145/wofuxububonux.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/nevirumumusowozapebumezu.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/55525138613.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087b34294a51---7899719935.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=artificial+academy+wiki
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e170992028---77101535689.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013827.bin
d6124aa6daa90d7ec145546261df648bde7b8a099ada05cc968a86fc1458e746		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13827 10520 bytes
font_01_sfnt_off0001502c.bin
97d8dd63e67a62aedcb13bd23cf14e1a309c672530646ef9580b82e2d3af3b30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 7596 bytes
font_02_sfnt_off00016a56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A56 16792 bytes
font_03_sfnt_off00018268.bin
58434a0441adc6e762c4b4404cc248501d26bb57068ee0616b087e543350c15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18268 17540 bytes

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