Malicious PDF — malware analysis report

Static analysis result for SHA-256 293957f3e3dc24ed…

MALICIOUS

PDF

84.3 KB Created: 2021-09-12 02:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 658cb9ea9a22ecfefdc9a826cd28b52f SHA-1: e5b467b7f9a4843c46da1d2b34f82ff7cd5133a3 SHA-256: 293957f3e3dc24edbfca9df3b3eeaa737fa60575573560a3bfb70f2e0d35a4fa
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/70600561415.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161329e45a89ba---nonokedo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/e41mpcpkjjao76o1mi6g5qvsuh/kolipirazapapuromavuvaliz.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wixudowenowolevikima.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a2c5925f---33258565264.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/nilewitupoguwiwogazofa.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/66911170036.pdfIn PDF document text
    • https://kermanrooz.com/img/files/togemomomejagipebabuke.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/tamezunotiwusaxasopufinud.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89236426065.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ng4fj4soflaujl2spa5gn64g4u/890921393.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/48894642637.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/82986645927.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/vuzudimotin.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/44997551580.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/novakabopubir.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912045919.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/jasefivezijul.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/burawima.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vogobasewureviposus.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f06e4f00---54752375352.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109110553444147.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/35731502509.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/lemavewakasinivonaresazub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=completing+the+square+answersPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 11060 bytes
SHA-256: 9030bea2aa62288cef9ff0b917282a85d8b1db3bcb6287540f65647d25bb603a
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 18916 bytes
SHA-256: b89fed23c338c2923c1578fce03424fef297b4c8968ae22d37effcbb07fe9eb7
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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