Malicious PDF — malware analysis report

Static analysis result for SHA-256 db72f96626a1cf1f…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 15:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e52652341b917e3a0a37460c3944de77 SHA-1: 22804e36ebccf015d3a962d7fb82138412e38cf7 SHA-256: db72f96626a1cf1f7788b415bb2aa74aab439088a3b320d9b8d198eba64f939f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to phishing pages or download further malware. The presence of multiple external URIs and link farms indicates a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=india%27s+foreign+policy+rajiv+sikri+pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b770dae6---bifonemunefilixafevaxola.pdf
    • http://littlepearlbooks.in/data/eimages/file/52134322965.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/78108905987.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34d1c451c---tuwabazovawebibaxamu.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ad28cf2e---96249180228.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f30581cb.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/51oihkma6o4ils82eik4huug0i/98503292240.pdf
    • http://beijingxinzhi.com/userfiles/file/20210518121831_1183509866.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7d5e4eb9065b9be84043bde2cda82194/govarigiwenutod.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b54b235f91a437d3c7f72d2726890e45/84784507560.pdf
    • https://atraba-holding.com/userfiles/file/18586648635.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f86e476c---napet.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e3c7c922885057e26a9ef97f2c9635c2/29493735393.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1acd0ef57---58239038640.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/1evispr1h01kmcror19tq76tr3/nitozububedisefane.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/09b0a1d0316ace092e38ed81386fecee/wikamekelix.pdf
    • https://dm288.com/slicice/file/21627427337.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e4f95631e6ab2c4cdcd2709b31004795/94494118881.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/bonenuxuzotaloxomibad.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f06c1b42565ceb04a85f413bf496b342/69685932717.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a546690dde22864caf040fdc1d0e2065/54927741316.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e167b8f298---kidubekefat.pdf
    • https://limmaginebistrot.com/file/womezew.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b4602fc4b---buxerofokomigufot.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076992da832f---92645047714.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078143e8647d---pilawokubuworatudaboton.pdf
    • https://machnhaduong.com/images/uploads/files/92121811593.pdf
    • http://yossy.biz/userfiles/file/tisikoti.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_off0000f874.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF874 16792 bytes
font_01_sfnt_off00011086.bin
a6f4f6a49a8e1244b5c185bd33a051218e2f48672fee406c420b11f7d44ae742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16844 bytes
font_02_sfnt_off00013c07.bin
f4ad3bb2b4c22aa5cd216b7ec0cbdc065bb0f5de645126fb650b12a5a36ea7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C07 11084 bytes

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