Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ba242a285fb5ba…

MALICIOUS

PDF

103.2 KB Created: 2021-09-03 09:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a90521b7810d98a5b4e71b109491b5d3 SHA-1: 53ff9bcbab6e97c453671379b18b7b57a56ccfc3 SHA-256: 82ba242a285fb5ba51bdd1bb6d30086b38acb0c90fe821b1280dcb8e032d0067
196 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external PDFs hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway scanning and deliver a secondary payload. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://honghow.com/ckfinder/userfiles/files/68613129909.pdf In PDF document text
    • https://hkbca.org/UploadFiles/file/20210523142711199.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a83f1a14e---riwevobidubid.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/72481343086.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/jozuxasak.pdfIn PDF document text
    • https://koratspring.com/upload/file/xelevejijunagi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ee1b963093dbed67bd26bc6323839a04/xejuginavoliwute.pdfIn PDF document text
    • https://andana.us/files/files/piwopadajisiwupapiwixira.pdfIn PDF document text
    • http://azizolace.cz/images/file/77860624704.pdfIn PDF document text
    • http://chayka-svg.ru/files/88154021613.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/ragiditises.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24c515438---78885675647.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/75170760339.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/83ba7c764affd068022a86fbe50b8e59/84915547442.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/vexupiwusafojujugawalup.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc33bbc462---86041688308.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/10541873790.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c21321ef854001f5fa813168ac0120e3/75140297976.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/80026105643.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/46086157045.pdfIn PDF document text
    • http://apcmagon.com/userfiles/fitigiboz.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210712_EF2FC49D39075BF8.pdfIn PDF document text
    • https://campermagazine.tv/public/file/nisemanila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=codex+adeptus+astartes+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C5 10716 bytes
SHA-256: 8a6c062f336481d441b38c5755192956e7f0b55b80ebc3d57a15163560e20c0d
font_02_sfnt_off00015b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B9E 19304 bytes
SHA-256: 788cb8a2f2adea83aa7052317fd6668d28e46c96fc9e635cbc5458ff9689dbbf

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