Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9fd68528d4649a…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 04:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e6c2e55cd748993feb73b41f26db3c2 SHA-1: c32ad314fc8a80a96464c29d3ef7f2904319f53d SHA-256: 8c9fd68528d4649a5565f4b8cc0c297ad04f19585cfe7aa79b3928fa7545bde2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as redirects to malicious content, aiming to trick users into downloading further malware or divulging sensitive information. No scripts were extracted from this sample.

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 https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a14bedc74---33898861102.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae519132da1---badakomeze.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/igqptfiq4so82ei8c872vt5ljb/didobex.pdf
    • http://wooshin.kr/uploaded/file/170825937360bc6ead93e3e.pdf
    • http://zezoalza.com/ckupload/files/69782361921.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/dgepu19qddbjh9aub9khn7jnt4/15630290144.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918beca1cf8---vezutisugupakob.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/lisusududomolo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7144a6f5e5---23215429000.pdf
    • https://meganimal.pt/site/upload/file/68022140798.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f39e465cc---loxulezagiresubariwid.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e15f6cfe84c3268958e57c381a215d3f/53118575759.pdf
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/gifeguwifabu.pdf
    • http://lungshingcentre.com/userfiles/goxeref.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609403bae531f---vozomujudapodox.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609727587ee9f---duropedeguwokone.pdf
    • http://upoart.com/ckfinder/userfiles/files/laloxubiwopukexogimuga.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/jb4a87c8h2akorcg1oc6h228ic/66411512529.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a022082782---17811953280.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8deb7b730e---nupazexugumomazuju.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd6c7d999---12977027172.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b590f7b79ec---vekuwites.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd49e2d82---16339595967.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=if+clause+and+main+clause+examples
    • 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_off0000e5e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 16792 bytes
font_01_sfnt_off0000fe00.bin
4aabe10751794c94f7cfd4005c12100b0e5d29686262dbef50924fd6884f857f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 10616 bytes
font_02_sfnt_off00011632.bin
afd00afb1c01db9323992e83724401d24af2fa71fe82f1e8c1f78c1e08ab77e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16656 bytes