Malicious PDF — malware analysis report

Static analysis result for SHA-256 00770e380650fbda…

MALICIOUS

PDF

86.0 KB Created: 2021-08-24 20:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 414b9e5a59b5130b6da9bceeda21e23a SHA-1: 43e6e2a92b35c4dc87393233b36b401eca9079fe SHA-256: 00770e380650fbdac74cdba84c7b65a8acd9b65e657d082ff86482825fa150fb
132 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3161

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://inwebjor.ru/uplcv?utm_term=150+kcal+to+kg PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7cc7f0a72---vaguvumus.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7b6b7977e566f04881e06d47cb96c77b/78483797782.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ff9c829b3949be195e7c48d68f1253cf/67242510361.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/67503942863.pdfIn PDF document text
    • http://clerus.hu/files/file/41072231711.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/15195320909.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8907e24e---47348939008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc8f161c6---48014352581.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/65142278956.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd629b0b3c---menedasedumike.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/damojivadunuvovoba.pdfIn PDF document text
    • http://poultech.net/d/files/bokomasugogoju.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/65702670243.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210722/210722165423512292gdo1l7m6yx0a.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/61992326712.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/18669543574.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f10fa01fe8---66159347724.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/23927188846.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/546f12f00a292f4ffd9e0948869ee3ad/xunajisuvejokefodiba.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/kudupafuzejusavavovojuwi.pdfIn PDF document text
    • https://strechybenesov.cz/content/muzonivezi.pdfIn PDF document text
    • http://youil.org/userData/board/file/xefopetowimabizos.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d611f79252f---32786453112.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/buxaxevetesewilekuburofo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502090515_455379947.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 17384 bytes
SHA-256: cd4779b93698b3de34e0faea7f76d75fc5334c16358e50b34a21a34f5202cf77
font_01_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1