Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf23bb0beabff4f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9788ce6bf51af760f2f72644c4f395b SHA-1: 570674f9d4f58f42ddce03050a10c3c6a1cb5370 SHA-256: acf23bb0beabff4f6e939f4eef594f54017223d5bcdb67d676bb870d9a1a20e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16073a982c5589---90097792652.pdf In PDF document text
    • http://chikatere.com/Upload/files/60275822897.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/ferobagumoviwuzeri.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/63b309959a51da991bc02e54e4133166/xutozoxuzib.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/pewikekam.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/94797261764.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/vevurafikut.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/jatapobolavemukufe.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a1b960a8---bavinizob.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/wezejuta.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/39100492278.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db92a02896---56835225673.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89268178907.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/sujilusupilomevoregigipom.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/46977722434.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/32207320657.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/74407929847.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/gewunisitanomonineviwe.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8624e4c574---dubageronanijokevigej.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45c60bb7a4---4400749979.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/40352110855.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/pofapozifa.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/7261238147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=antrag+auf+steuerklassenwechsel+pdf+ausf%C3%BCllbarPDF 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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 11276 bytes
SHA-256: 91439406011b8158ab3bf93f025dd0dc3e05f1b681b6efa5644630351b7da10b
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 18140 bytes
SHA-256: 4cc682038ee6f7dddf1757b608761ca84bda382ba3d0750e0cbb1226dfeb7b4f
font_02_sfnt_off00010e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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