Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a1344a03edcb96…

MALICIOUS

PDF

81.7 KB Created: 2021-08-15 03:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c1e9ca6f8b2ad8bbb292c7d002e996d SHA-1: 51fe89b8a0317916a87f47df26ed38046c672e38 SHA-256: 24a1344a03edcb96d8160f95368150aa1210d417eafb01171b5dae642cc836c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating malicious actions, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thaisomboonautopart.com/userfiles/files/22593040547.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4f30939845e9dee4db1b98e219e4a4bf/63485387021.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d311fb4bb0---nunifugovenatejepufidi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/41257601626.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/50192516908.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/gawerelu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f624102c6---bubebitamaxet.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-9/20210809073118129097.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0e815289f3dff3a322f8799585a0c49a/37839650506.pdfIn PDF document text
    • https://susta.vn/userfiles/file/soxutalevogunasimexuk.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bf4e3d48---77958232983.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/96003781758.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d790f21c9ba4e03a956ce048e44cd27b/vuzirelibotelideduj.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wurixozowamabiwu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a43c15d6d---lubilipun.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/91229265422.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9ps5agj38l3lqhofhpmghvhqkm/mosonugeju.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9rkps5us2r8a2dschee9lqmbt2/sowunowukogavakajunililus.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wukebafajomijod.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/lerufibogufafiwudelonuza.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/lovano.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/garoxe.pdfIn PDF document text
    • https://gilbertems.com/videos/file/muvazusoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=authorization+letter+sample+to+get+birth+certificatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 16620 bytes
SHA-256: a70173905f14decf928875e87ef162febcae6df712fad98a160965982cf00421
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 11208 bytes
SHA-256: 53a78edd3d5000b976240211dab845414d0436143e33e55a80a1a755c294a932

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