Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c157255bcb8d261…

MALICIOUS

PDF

76.6 KB Created: 2021-06-28 07:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a7b2b8ece14e54da33e4d834ec08215 SHA-1: c92d2f183954a9e606f2bda9e097c73ae3700771 SHA-256: 0c157255bcb8d26127ed55412a6814e01c5c0f611a93b8e6ae3cdf5544a4b26c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The file's structure suggests it's designed to lure users into clicking these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gapoom.com/upload/fckeditor/file/gavidutibujorus.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c42bb9f72---wanerem.pdf
    • http://linkingpeople.info/userfiles/file/74226179589.pdf
    • http://eot.mn/uploads/userfiles/files/goponemunewemif.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b73c68dc78f---pajima.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094a5831ab57---6948427258.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/zosomozipavanijuto.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0e8d40fea224157aa306c0de89ed196e/safemebox.pdf
    • http://ccforum.kr/uploads/file/1624862923.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/93241837766.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609636c39ffe0---miregupukedaxenojuka.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b0897eeb6---58893914393.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jne16ddliov9a4tbuqmm2ke9q4/zosowa.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9e0e702e8---zeladezumopobuf.pdf
    • http://adabaskimerkezi.com/upload/file/36212381894.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e000508c35---67646383768.pdf
    • https://dnmpaint.com/sdcc/images/file/31929513053.pdf
    • http://dichvugiayphep.biz/upload/ck/files/tipun.pdf
    • http://engroupe.ca/aym_image/files/82530904636.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0274273e0---filesulasod.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc158f35c---gevezozavofifexonunonun.pdf
    • https://igruppe.no/ckfinder/userfiles//files/85945805631.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074332b8f711---wusixemujirupixanojoke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=immunology+microbiology+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_off0000c8aa.bin
285ee734d46ed3eaa483cbdf4041ab15f1969e4f956dc4b4df21b68e80d5d6e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 10708 bytes
font_01_sfnt_off0000e0af.bin
ecac381033cd1d786a55bc3258aad7a398672fcbd3d8e1d5a6e0c1878a19f287
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 17120 bytes
font_02_sfnt_off00010d22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes