Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f15dbdd802c794…

MALICIOUS

PDF

86.5 KB Created: 2021-09-03 18:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ea2df5273f42219891e591727bd2d2bb SHA-1: 0bc3fb91d01b7f539b70bbb825c4519021813210 SHA-256: 91f15dbdd802c794e929d96c89247a3625ca273eb9bc60119924b1a8657f69d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=hrm+practices+and+employee+performance+pdf PDF link annotation
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991a871fa8c---13086783115.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/dirosanabubo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/25519249372.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/79517292701.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/giwimotan.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/072ff66e0084fccc761425aba65f7522/26719805258.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/52969911524.pdfIn PDF document text
    • http://www.celso.org/download/wekafitapatoxuv.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/toxujaviforuwag.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/6456592153.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d7a1caa760b878b68d83f9fd19cb7bad/20317676478.pdfIn PDF document text
    • http://vkts.se/userfiles/file/683747794.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57fe86edd7---22900644562.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/95414082013.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d5c017ce---55445908882.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa53079085---tuvirujapamugomum.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b10825e97---60885694690.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kemoputorovu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s2j5ehn6b2kk8qto6r3lkv58dh/junoxekeluxam.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/76529445732.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/afdc7b466b9a8084e97e5dc15ae8c7e6/rafedunipuxiva.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF36 17704 bytes
SHA-256: 8bf83ce1149695f34790ff5e95600f1c7cf3875407c88d74b23882da0cc37b78
font_00_sfnt_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 16428 bytes
SHA-256: 692441bbbf473f1aa7316ee453e60258e5bc2c5087b70e7d88483aec13190f8e
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001327e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327E 10888 bytes
SHA-256: 4b7747ae7a2046518b330642844fe4312a2df9b71d4f0b1d08d03046aec70967

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