Malicious PDF — malware analysis report

Static analysis result for SHA-256 725d1838d9bb8c91…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 12:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fd56ffd5669164b7a1515a22f59cc54 SHA-1: 3fd8a860b45790df1ac2026be5ae6e559889663b SHA-256: 725d1838d9bb8c91e0f4c83fc3d00df524247acf63759f4ad31e52c71a4a4cda
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=resident+evil+how+to+get+the+shotgun
    • http://wellogo.in/userfiles/file///sobebelibol.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/pefusetagexu.pdf
    • http://rurisnet.org/images/file/zugorezag.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdf
    • http://revucue.com/ckfinder/userfiles/files/betotutewide.pdf
    • https://polaria.cz/images/file/68592373575.pdf
    • https://ubitanduk.com/contents/files/51970505169.pdf
    • https://otoform.com/upload/ckfinder/files/jujaluralepisetoxopajob.pdf
    • http://irpuyesh.com/cache/fck_files/file/39571895052.pdf
    • http://younewstoday.com/task/userimages/file/majuweb.pdf
    • http://zagazzo.com/userfiles/file/tiwozomevogezibevamenijox.pdf
    • http://parkingparts.com/Upfiles/file/35695977186.pdf
    • http://lobanowscy.pl/userfiles/file/66567819893.pdf
    • http://strahyi.ru/images/file/17140061151.pdf
    • http://karpatskiles.ru/store/file/kemomosujo.pdf
    • http://hamkr.com/userData/board/file/59025973066.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/beea2bff01084bf1d82282ede0c2e657/fasifekedatejorosatodene.pdf
    • http://les-dvorik.ru/userfiles/file/29346202679.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_63BA4ED34674AE8D.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f572741712---binuxidipugefupemapuvuta.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/73805206651.pdf
    • https://novitas.ro/files/15712795452.pdf
    • http://hajnysport.cz/FCK_userfiles/file/puvufoxulonikudesid.pdf
    • 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_off0000d2d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D1 16792 bytes
font_01_sfnt_off0000eae3.bin
7fb5567da50f2dc19ef8baaad23293b3456e067a34dcde103049eb9319634e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 16940 bytes
font_02_sfnt_off00011699.bin
2da7422edde262e535cef382de045de9065d6a89cb3c987fe67ca2788f002f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 10564 bytes

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