Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7289c8ca37ab17f…

MALICIOUS

PDF

89.9 KB Created: 2021-07-23 13:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d37526fdab35b70d6bd9ec619951da47 SHA-1: 483d92fa2c4d5cfcad4523db668f742b06004df9 SHA-256: c7289c8ca37ab17f8157a1acbb395652774a2f41f6ab8d99941db95438d8fa3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allcreaturesinc.com/files/files/vijevorufipelu.pdf
    • http://industrialdevices.in/uploads/timave.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc458561eb0---80246101708.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2aaf2ba4---68659793949.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/pfqr9l6sdbgr1dtuft2p19m75f/76881947536.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f352fa2171---gikabavojozukupoxujazaki.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad16575050---24002672327.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9914df2b5---30968715203.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/tewogawobejip.pdf
    • http://katheran.com/clients/55933/File/67266883611.pdf
    • http://biomassasia.net/data_ed/userfiles/file/munolimem.pdf
    • http://pnktools-th.org/ckfinder/userfiles/files/pivonokogimire.pdf
    • http://hnc2.com/userfiles/file/94274257263.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/31891709682.pdf
    • https://emmaushuis.org/pages/60425624181.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8267b5b22e60a34246493f0e9bc9a5dc/xubetakezexutapovujefaro.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5q1s35mcvgdbdt6ejpjop4nnl/73028478007.pdf
    • http://strap.sk/uploads/files/budikojulax.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6522a6c4184fc7adcd699a0a077560a1/3660405700.pdf
    • http://dellalontra.it/userfiles/files/92328296813.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d8dc694e---71842883494.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/30be9ef843ab8733f4018f18dd3d2989/kukake.pdf
    • http://rideabikenews.com/user_img/files/sagiralo.pdf
    • https://medsplus.us/admin/images/file/62434748832.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160815b7f776b2---nizasoziwigewoki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=is+the+mitsubishi+rvr+a+good+car
    • 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_off0000fbad.bin
817be4d07a5d68d4f13445cc4d82b0ea42de817db2e9ee30022e59fc5c3a103d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 17136 bytes
font_01_sfnt_off00012885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 16792 bytes
font_02_sfnt_off0001409c.bin
9fe430fc78cacb83140627b662a0a968098833939d4e10c82906f78f31467e10
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 10924 bytes