Malicious PDF — malware analysis report

Static analysis result for SHA-256 390d0515313e3587…

MALICIOUS

PDF

134.7 KB Created: 2021-06-28 23:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c4a55ec33350d727d43480e8f285def5 SHA-1: 2de7377cbfc82a80ae507244e3ee1f83a555dd63 SHA-256: 390d0515313e3587b00cc747bb13ce234bf296449f990e203ae44217bdc31277
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a vessel for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://minegociomiweb.com/userfiles/file/wogagakakevuralega.pdf In PDF document text
    • http://esejsc.com/upload/files/11433319205.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/6940807954.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/cd46dd2064fbbc4be3a7ccdac92a2ba1/46705260907.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/sexazegupusa.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d16e49217---niririneta.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/poniriturararizu.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/vatoworedez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084858b741c4---90241176167.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53287431745.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160792ed4a7d0d---24903313900.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/25121d2768c9c2240cb048e16ec7eb77/71761665635.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c881c2e4f09---29232555040.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/1335867663.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d234e6e31b93873bb9fb09cca7384b74/vetebipavisovozubiniwukib.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/cbf68d534071a399cf7169ba1c392f9d/91875904868.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e803258a---berojerofupag.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1d64fdc0f0838aac609ab65173043e83/jetobovanoretiwijazoz.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/dufavoripuwiresesakake.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/meleputuwosas.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/21168636414.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/327a8a71b86615d2c49082e0bc3a5679/26887581253.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4209f318f---tajegowadodimim.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kabojakorafidopalilurib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=relationship+between+gender+and+religion+pdfPDF 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_off0001a86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C07E 18920 bytes
SHA-256: c741dd14ac7abb26f43e9438923c90d5baa9a65ccd437eceeeb35f177e6cd1b5
font_02_sfnt_off0001f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1AD 11048 bytes
SHA-256: 5e53c3d315e114dca67626d058f1c5ba47e487416c95093211a29dea23503f5c