Malicious PDF — malware analysis report

Static analysis result for SHA-256 9343734b699e65d7…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 19:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ba5ac9ce2652da45acecb92405437f1 SHA-1: 3ab0878fc71caa347b6be3977f1a4cd4f481336d SHA-256: 9343734b699e65d7960d1c2fcafcb8f1ecde063262c0700425dbb1f41a44a36e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pistant.ru/uplcv?utm_term=today%27s+stock+biggest+losers
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a740f57d09f---vodasupezerof.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/a62f9211e151d73225304add1e5abd6f/lovatoradunegenu.pdf
    • https://ortechindustries.ca/ci/userfiles/files/kewuno.pdf
    • http://fsoa.cn/userfiles/file/20717470580.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/zevubij.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/9d440a5b632bf028b99d6265ea2c3e4c/30192611332.pdf
    • https://atl-50.com/files/file/13098467100.pdf
    • https://pass-eco-energies.com/ckfinder/userfiles/files/nuxukubolelujojokegoni.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e62623e8e5b38c7f84c29aa524b0cb14/jerodalujo.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78b93d81fb---zalotolanelodan.pdf
    • https://summit-christian-academy.org/scauserfiles/files/lobidur.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/885e667a0ce2f9a5d756ebd9667ac293/45570805344.pdf
    • http://fine-cottage.ru/userfiles/file/49764286405.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ae386cdb8e0c308d553a0093dbf68701/98945580763.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf2a5b4d---63289572287.pdf
    • http://thedigitalscorecard.com/userfiles/files/nutabelosodizololuw.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31970d1f24---tewimafovanamidezumiv.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d9f4df5067cf9df07bbbb43c34a20b1e/nujezowa.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/gjrideiuva8t4jfln4i2ab6hj3/julepizuxotinetepi.pdf
    • https://tadimtursu.com/image/files/sigozopemaxoka.pdf
    • https://avigailpekelman.com/sites/default/files/file/21546193463.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f408e610a3---bexogit.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b7e2f1ed---kuvulaluxu.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c2f559fd---simuxewotodipazu.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081cc1ee246c---18417297546.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087384389a7a---66878013398.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_off0000f596.bin
47761a01b0c206727ad1da06f5b717015613b68925ad0830e64eb76f0a8a831d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 17504 bytes
font_01_sfnt_off000123d0.bin
72654bdd80700cf9f77426b31570f85e747c9e6ad0d176ad57496d98907f27bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10784 bytes
font_02_sfnt_off00013cb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB2 16792 bytes