Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2e8fcc01610706…

MALICIOUS

PDF

84.0 KB Created: 2021-07-19 20:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5df118ba0bda196c2a730c8d5852e1d9 SHA-1: 933f767fe5524eff71c712536bd7a1176a0ead93 SHA-256: 9c2e8fcc01610706729662c15f0045dbbc01cffc904b07f4691768068492ddf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afde1ba41---gidobomubuxu.pdf
    • https://zhbiotech.com/CKEdit/upload/files/xinikenobolidelukabimat.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae99e0897c8---73590245146.pdf
    • http://webursitet.org/Files/file/96564207183.pdf
    • https://whitesal.com/data/images/file/3973_20210628194551.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160998917d9b1c---97181960367.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/92490282325.pdf
    • http://vimbark.sk/editor_uploads/files/71863705229.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefc92e1ba---49437491261.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/bf104c35c56d96a6aa471c79d7b12c0d/49613336052.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d333e817cf---91395846737.pdf
    • http://naosgym.com/userfiles/files/vikiputefaxewi.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/mu4bbl2sgvpd9jhpggak8a177c/87633670895.pdf
    • http://mtsskzy.com/userfiles/file/21738539791.pdf
    • https://doluhosting.com/calisma2/files/uploads/57534086908.pdf
    • http://adria-ex.com/images/blog//file/fokomepawerufufid.pdf
    • http://fixafilm.se/userfiles/file/xaxatagifudinugufejudupos.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608669a129142---negibukir.pdf
    • https://12shio2.com/contents//files/81978994709.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/59541329173.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd6807fd4---pakuz.pdf
    • http://apvn.info/userfiles/file/gugaxolojes.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/90023489466.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=drop+out+of
    • 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_off0000eb5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16792 bytes
font_01_sfnt_off00010374.bin
d0ca7254147b24d6195b89d4088f62e79b40e6af16cb79cd2acb1157fa86b97e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 9748 bytes
font_02_sfnt_off000118d0.bin
08dc9a4a2e30c49ad7e87a51a29f38d7f06d1f7f32197d4a9bf0ddb73b82c3e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D0 16492 bytes