Malicious PDF — malware analysis report

Static analysis result for SHA-256 1931198035b390be…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 00:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ece7d2503a1da78870353d9f88e78863 SHA-1: 4454a45646b72bd0a3ff3b75f486d2ae20c53b11 SHA-256: 1931198035b390beb037439d9f009acb14d9194adcbc5e157cab915d9accab6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URI heuristics and link farm indicators strongly suggests the document's purpose is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anmimar.com/royal/userfiles/file/vafaxinibisivuwubedij.pdf
    • http://bualuang101.com/backoffice/upload/files/pilofogitefobogafot.pdf
    • http://phone-server.com/userfiles/file/bagijilovewisez.pdf
    • https://autosaloncenter.com/uploads/file/xulemexawabilo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbccea12aa---xuwidel.pdf
    • http://sgyscom.com/upload_fck/file/2021-8-25/20210825132931526831.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/109ed5f1c50c277251ec9f250c2bcd41/83312903915.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/57b9112fcebbb77e09048b35e411c35c/70331773619.pdf
    • http://baovevietnam-vnss.com/upload/file/gaseturexusejevegetew.pdf
    • https://highlander-inn.com/assets/userfiles/files/57937695295.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/415aaf8c3bbd4b1a9dd0faf311b5d223/dusixewujoluzamotos.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc32cc30d---60588382863.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/vibjmbvgjs8urua66urhi596oe/zarugokaniseguko.pdf
    • https://alshamiltrading.com/alshamilfiles/file/jifukasutobewuw.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a799d0727b---2882071744.pdf
    • https://glycocalyx.nl/userfiles/image/file/zowiw.pdf
    • http://partnercable.hu/files/saligarobinixabiwudefi.pdf
    • http://concilianavarra.com/userfiles/files/57319389970.pdf
    • http://www.polni.si/Images/files/kuxogegod.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092825b199eb---funipuzuzosugagut.pdf
    • http://foxhill101.com/userimages/89264249653.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b30e8071---valijalixeragokidenivoga.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e60bbe920f---fanexidadud.pdf
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/68662095593.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=macro+excel+tutorial+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_off0000cf29.bin
aec3d34b0fc4eb19f4839f56fc689c2a4b8a64d43604444b6350c2e8d42f6fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 10536 bytes
font_01_sfnt_off0000e74d.bin
f37c142169425317dec0801159c4d2556d92ca18bd484e6400132fb54639e4ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 17208 bytes
font_02_sfnt_off000113de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 16792 bytes