Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dedeb6d6d0b7354…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 03:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 459c0db514940465f63ea7750a619d42 SHA-1: b0bfd89d23b7df2f123d1b5c49617cc65a7bde30 SHA-256: 7dedeb6d6d0b7354e302c9a42afc19bfc77c6d54e0b7953c83cc4de8233d4927
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories or disposable domains. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://oniceh.ru/uplcv?utm_term=the+outpost+torrent PDF link annotation
    • https://weborder.cloud/userfiles/file///mademufagivujuvesizefa.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/pufan.pdfIn PDF document text
    • https://phnews.ro/files/file/gadixiloviboruxejamodu.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409d2be907e---tajubofiv.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/jubowixegodopulusemur.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f279f8c4---9599899981.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/10725992861.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/87859625584.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/12902984923.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kiniz.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vozejubotuzivuseramemem.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450d7033fe4---dodajuvobatupij.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/2329124223.pdfIn PDF document text
    • http://woykoff.hu/upload/file/dasejovudadepena.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/65247712352.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/84771715006.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/jodap.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/60987800112.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/80375975311.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/21191427549.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/47488651364.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 10112 bytes
SHA-256: 8779ef18d3903539c23483e290265f33e93cce4bd289f7f5cf16caf778511594
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 18344 bytes
SHA-256: d2f41a78685e84a4b559a406532f391384065a501549fc7d5a8b18110e58ba77
font_02_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1