Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffea884374df494…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 00:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6b093252b88ccd60b570c0b168af443 SHA-1: 136cc301adefdd5860d70b513f3f953f14d6adc7 SHA-256: bffea884374df494db92545fc00a86664671349f67ae3a117400317122279910
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8975a53e---62983144773.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b561f84f3b---33325137457.pdf
    • https://aviseco.ro/userfiles/file/43422765356.pdf
    • https://marlin-shop.ru/ckfinder/userfiles/files/nirexa.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uk28vma4mp73pfs1odp7cenboq/3397311982.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/23802813983.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tcob4ekis9lpbk2a8jqs788n4/80358272061.pdf
    • http://dekoblickfang.de/userfiles/file/15391010802.pdf
    • https://acconpriti.com/ckfinder/userfiles/files/26306473993.pdf
    • https://mosconi.net/userfiles/file/23046916425.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145285fdf52c---bikozeforurosoxawijenin.pdf
    • https://manorhair.com/uploads/files/202109191314219248.pdf
    • http://parfumerieindex.nl/images/uploads/gutoguwafisiwudimara.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a66fe587afcaae5fc09351007021f168/dikabuligolav.pdf
    • http://sonarkella.com/userfiles/file/dixurukexejibadadovasa.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/varuzulipazixivizevidago.pdf
    • http://www.binghan.my/userfiles/file/fugebimo.pdf
    • https://dnm.tw/uploads/files/202109070947022172.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=function+of+stigma+style+and+ovary
    • 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_off0000aa56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA56 16792 bytes
font_01_sfnt_off0000c268.bin
8947c76f58adb9b66b24cb6c3408d9bb187e36101aa1cdf848e38ba94dfbf70e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC268 17080 bytes
font_02_sfnt_off0000ee0b.bin
f6834bc245f88f565a5ef82aa828efe833ade10bd81bd39a7f687505b92967e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 11076 bytes

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