Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca92b258a5e2a8c…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 16:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4767a7767e07b3533a923264a83c1b18 SHA-1: af8ad7e408ff884d1362a87e1e8867fef7ff4840 SHA-256: 6ca92b258a5e2a8ca9f775b714ece389221349cc7b55da08abcc1f6bd2384714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on compromised CMS upload directories. These links likely serve as redirects to phishing pages or malware download sites, aiming to deceive users into clicking them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16113af845840e---40211644176.pdf
    • http://gernano.eu/gfx/userfiles/files/87567468174.pdf
    • http://liavanhaeringen.nl/userfiles/files/bapajuvuralupagujelowiwa.pdf
    • http://botosani.ro/img/uploads/file/kajevowepa.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c08ece5da37---63287153151.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/a9e9d8114136dfbc82d4a13c7b93951a/mifepixiwaguwazokidemuf.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d071aec2badbdf3498e03da34599e8ff/89831248492.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qet2dajibvahhvrtj5kco12njn/37159583789.pdf
    • http://stagelight.pl/userfiles/files/91906139870.pdf
    • https://kaptenhoki.net/contents/files/tizaviw.pdf
    • http://xn--80aikni6a0b.xn--p1ai/images/file/monunamileluxikuz.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/jofosidagixipam.pdf
    • https://jin-hung.com/userfiles/file/99423239134.pdf
    • http://nerezove-kuchyne.cz/UserFiles/File/sidabipevominovavo.pdf
    • https://bednidhitraders.com/userfiles/file/41736624900.pdf
    • http://scan3dsaigon.com/upload/files/47269472989.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd68d604cd---jamebubitazaxib.pdf
    • https://pakistanchristiancongress.org/userfiles/file/fijajedeniwegufediwafajad.pdf
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/70686518205.pdf
    • http://www.polni.si/Images/files/17384018140.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/10298233634.pdf
    • https://khachsan295doson.vn/namthuan/images/news/files/55909283989.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0b3de8f77---59267825713.pdf
    • http://aatmicscience.org/asuserfiles/file/fijupanovi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=technology+then+and+now+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_off00010395.bin
785f277bf3acdef7eed22f049ad9d23bf6c78e73782c44cf9f71a1d81a2e5699
pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 18240 bytes
font_01_sfnt_off0001326d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1326D 16792 bytes
font_02_sfnt_off00014a84.bin
aba0e7223fda01401236c96f34927b78a953555bda760441ee1d49d811d014e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A84 10700 bytes