Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c7cf451ba6256e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-14 10:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4d22948a9e4546ab704c87cac7d5554 SHA-1: 7ff531ff22b5abcb812eaaecbec1dfd3f5c99d5a SHA-256: 99c7cf451ba6256e07373428c347d061f9e6bb4c2d10cf8786c7e61783de9e86
216 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external PDF files hosted on potentially compromised or disposable domains. The critical 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggests the document's intent is to trick users into revealing sensitive recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/bumimevu.pdf In PDF document text
    • https://geloracinta.com/contents/files/28890846763.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc88a7ec---kixobogolumojil.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/duxojetagibesanube.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/pokojosuvupubinazukuzo.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/2065572689.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613439cc5f47d---67552688969.pdfIn PDF document text
    • http://tzsunup.com/upload/69682369606.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/52737510991.pdfIn PDF document text
    • http://katela.net/userData/board/file/rogiwavusugegemu.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/18145925151.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/disoginiletajedetumunidib.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/77d229ff3d747e114b8058bb487292e2/97411233519.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/77006036252.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/94206946742.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/todotejeguj.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rigupajawot.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/posokikadixonemili.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jinolazofep.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/89789771090.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/pebenedemarobaxewem.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pudotipe.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/somukenupugamavitezikut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+jks+filePDF 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_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10292 bytes
SHA-256: bd6b2e78b5ba178afc94b06a361198d2333e0eca0e31ad7fc8614a05aac9c3e9
font_02_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 18448 bytes
SHA-256: 92bde8052017750e29e8670a25f5cb4ceafd24a9a9d123090d4c8df7248f072c

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