Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ad499af3fac720…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 18:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 520bf61f810d595a34ef9934d7be9f7f SHA-1: cf572ae655d4a8679e084096eee58b4369f8f3eb SHA-256: 93ad499af3fac720bd6fc624f05e813bddfa53b533095ff6bd2f3b8652072d84
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, including compromised WordPress uploads and disposable hosting, designed to redirect users to malicious content. The presence of numerous external URIs and link farm heuristics strongly indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=android+ui+designer+tutorial PDF link annotation
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gibaxesivofukoxogox.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/11884726178.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/dakeporoda.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/75413404690.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/80c4b174fb8affa84355ffda13108f29/lagibeme.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210903064818.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/79413287643.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/tosetokejuwuxotig.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/23711819456.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tusexalurasudipaf.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613191388445c---nuxinujizakadolikumuliji.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/91930349057.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210905_CEFCD62386AA772B.pdfIn PDF document text
    • http://sushibelovo.ru/files/levesujelarixulabofoke.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopudalazogixiwa.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/kojefevomexowufawalajo.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/wavexudikoxaz.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/xisexo.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/46291921706.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/tavizanoni.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/pibikimatorogujasigepe.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_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 10504 bytes
SHA-256: 1286917ef776f1cda81aa66364ffafa588917909004dd8eede0af4ca55d82fea
font_01_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 17852 bytes
SHA-256: 56c05cf70baa0f9ae1563a59e68cd26ce15c9c8fecab577f85effbe44e9d0830
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1