Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb65009bf17eac06…

MALICIOUS

PDF

79.0 KB Created: 2021-10-07 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3f35f7384c6129838c675578ddcfaef SHA-1: d0c404c982002276f444344e5512c9900cbb9a3d SHA-256: eb65009bf17eac063c4383770d53c9313ba1193e084576ee7010ee20d677e711
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a pattern of directing users to potentially malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://spostojow.pl/userfiles/file/tagegari.pdf
    • https://weishinclinic.com/uploads/files/202109021150273928.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/69023062659676284c99a3db8c6dd2e9/80209357196.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/vogosidazasiserow.pdf
    • http://daydreamspin.com/userfiles/file/77036146147.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fcd26eda1---lenazebelokatanaranod.pdf
    • http://vilocom.net/webroot/img/files/lisorimireripuzediwibuvow.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/legikodubarilelu.pdf
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/53568127761.pdf
    • http://hightopeducation.com/cms_uploaded/file/jojezavagodofitoxezuti.pdf
    • https://llbyggodesign.se/UserFiles/files/jupez.pdf
    • http://templeton.sk/userfiles/file/39064477183.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d19689a0f---xosebizunemononodudojoju.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16144c13a482d8---dufepikutonox.pdf
    • http://gabortech.com/admin/file/50105561927.pdf
    • http://niktid.ru/userfiles/file/24429358660.pdf
    • http://area100impianti.it/userfiles/files/18379765928.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/gudasamapu.pdf
    • http://massvt.sk/editor_uploads/system/files/saxafexuvov.pdf
    • https://art-eria.pl/mandarynka/pliki/files/nojaxejodimaniki.pdf
    • http://giorgimpianti.com/userfiles/file/kanumirelalogigejovewe.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327657f41f0---7231688236.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/lasapukapotofipoxut.pdf
    • https://holcom-wd.com/webroot/img/files/puworufenewosuvo.pdf
    • http://sangsangins.com/upload/upload/file/27137256198.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=neet+past+10+years+question+paper
    • 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_off0000cc36.bin
43318b66a11649f18b43c892bf080f7190a79e2ed757fbe4d443ecbe9854c96f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 10708 bytes
font_01_sfnt_off0000e501.bin
8c6fb393fe7fbf3aea239c182eb0c1415278b915031c05126d0eba076b1b9e1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 18796 bytes
font_02_sfnt_off000115cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 16792 bytes