Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59c60eee1ee9f89…

MALICIOUS

PDF

78.1 KB Created: 2021-07-03 12:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ceb4f18c4ad58af1228696b10c73e9b SHA-1: 1d7fa5324bada62a83bc1884177246e624180f06 SHA-256: c59c60eee1ee9f89e00c7fdd6db3f1bd98d8aeed6b9b9e007861a50748102980
124 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories. The presence of these links and the 'link farm' heuristic strongly suggest an intent to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

Heuristics 5

  • 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
  • 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 http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee91febbd6---nilonajozeg.pdf In PDF document text
    • http://dwhs79.com/clients/15834/File/boniganetapoxujejosusuzeb.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd16d74ea---virojarejijuradamewerax.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/fidogokogosixejam.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/82716347822.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/48372655927.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a76ea9057---51603921665.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7204102627.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wotopokakawokikonuzisu.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/5a93f7797258746b8208f201b77d2219/tovuvabuwefaditake.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d62100ae---36805716522.pdfIn PDF document text
    • http://benetalent.com/upload/files/4831354411.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9f7715255102369d1e54627e40e13c1c/21768716116.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608d862e7341c---76132543062.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/75619ddbac68cf75072e70383b037980/dujitidaj.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb5c178c41---91154259676.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/64a828aed34a0dda57b706ced9836c35/92476106107.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607292247a9c0---94174438133.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210610/0630547192.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4f143c7ced6d651888b2da3a0cf5ea62/93670621445.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/86095611387.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/32272893894.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/618160391.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/wabinafuxuruvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+level+does+budew+evolve+in+pokemon+platinumPDF link annotation
    • 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_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001187d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187D 2036 bytes
SHA-256: 5cdeeb8177ef21ed6ae4615157799a8a196b361a999e88d01aed8ae5e418283f
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 11036 bytes
SHA-256: b9ed4e729e9ea868a6e4670b3d2b9a2e1a40b6ae05482cf929f592fc4515304f