Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e2bc878af72d0d…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 02:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5abb40295995bbfef6e895567dd45b15 SHA-1: a9b595c79556213ae959ed6e515267ba9dd10f5c SHA-256: c0e2bc878af72d0dac293eb397b736f20bcfe848e7aa65998c8a87c152408717
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://acpiindia.com/userfiles/file/tokodoz.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/03f51a27e72fcc29935c798713e7dec0/kiworuxogesemigivabizeber.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ecc23b5597a4dd8664a4c5fd03fb468f/jilaxuxobipuworoviw.pdf
    • http://taiwan-casters.com/userfiles/file/66299313596.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab443ae008c---topivaliporimotevefe.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5957fca780e2cfde917438d80b77f833/47819558947.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/d0e5c7249b0b86b47f91d35265dbb077/10331772707.pdf
    • https://alrukn.co/userfiles/files/texegajekovugitanaj.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e25dc3b1c6---mobosivezupewuzelezimob.pdf
    • http://www.kickcommerce.com/userfiles/file/kenileg.pdf
    • http://aaaexpressheating.com/userfiles/file/78076738327.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f038a84059---wenutogokib.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ac9b7b05ff1861f35246be5e54f7743a/galinifufi.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/0fjcbhg13nvkb0gvnu7jec9glb/68113291770.pdf
    • http://blackivy.pl/userfiles/file/43439846273.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d6bd39d0d264d72eb1b547adb021e473/tinifekazexini.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf6556a54---ralobifolaputorivo.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0818bfee7940675096014b568028b83/44919469779.pdf
    • https://aymsoft.us/aym_image/files/56946856175.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb2b8a8f83---91155279820.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0103dd98d---4535526050.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+western+philosophy+all+about
    • 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_off0000e732.bin
d620075e07a75555f86ccf2c96436a4cfc803224e81f849e8e80a2745b49ea6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10784 bytes
font_01_sfnt_off0000ffc9.bin
171a34b6901bc45ca0d75234a780143cc8e36a483d51dbad63df4549ca17da01
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC9 18772 bytes
font_02_sfnt_off00013109.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 16792 bytes