Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a93b3e6e81d1d2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11c14c3a8ef652e8e0c83b8d4ec70a48 SHA-1: 1aacd5a60bc2f7d1a52efda760462ba090b42e6e SHA-256: 48a93b3e6e81d1d2947b4f7e56aff63ed9b5d20a08b4df42ec2b3e4003f7997c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

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 https://coretry.ru/uplcv?utm_term=asphalt+9+legends+hack+ios
    • https://eastmanllc.net/ckfinder/userfiles/files/jazegareju.pdf
    • http://www.examnotice.in/uploads/files/jibabubigabe.pdf
    • http://generaltubi.com/container/ckfiles/files/jusosoworidezu.pdf
    • http://mosvag.ru/img/lib/file/12802676902.pdf
    • http://fotostudiovaccari.it/userfiles/files/77953768990.pdf
    • http://cartonwrappingmachine.com/userfiles/file/guparuwikesuroj.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/visitorugasagosowake.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/jutasaditojaroluzozigo.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/zovufolevofadijapekir.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c1b5a0b---fidixigoxosisakubazi.pdf
    • https://its-bulgaria.bg/files/file/43381706692.pdf
    • http://studioarchterreni.it/userfiles/files/pekaxuwururezabo.pdf
    • http://www.themixchange.com/userfiles/files/fupoli.pdf
    • http://nazycakes.com/userfiles/file/jejilipixidawi.pdf
    • http://ceramkgres.ru/userfiles/file/65632307951.pdf
    • http://skkouty.cz/ckfinder/userfiles/files/41089881998.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g8vvn02rvfur146040bunhkhk9/lamisakewovamosat.pdf
    • http://atenngo.com/admin/sites/site/documents/rekeli.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613059df16f68---saduvubemafowuzana.pdf
    • http://ckm-machinery.com/userfiles/files/19629231621.pdf
    • http://dnt-mayak.ru/content/File/8853675551.pdf
    • http://china-engine.net/ckfinder/userfiles/files/visinojaw.pdf
    • https://magicdiscoradio.hu/userfiles/file/ferinelig.pdf
    • http://maasmartcity.com/userfiles/file/varuzasibilirukibapenamo.pdf
    • http://china-spec.ru/userfiles/file/kokepibiboxuju.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_off0000b4c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C4 16792 bytes
font_01_sfnt_off0000ccdb.bin
13a7e1188764c1f99d324eb7f69f1d16377c7f4783c0b94ea5b1274e706b6e38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDB 10936 bytes
font_02_sfnt_off0000e602.bin
c544fe16d8d2774fc92339f76ea1d2cae07f8bad730c9531f50f3a0ac0569024		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 16660 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.