Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d51d10e171c670…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 07:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: db2427ae1f5a44cfdef6a3a5845a0068 SHA-1: 2bee8a441087f0cef95ba1452ed876e6e6ef1e0f SHA-256: f1d51d10e171c670d7fc0de6cd766c00570621d193e423c92be0f86e0b0fd5e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality, possibly by redirecting users or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nordavril.com/userfiles/file/78155090865.pdf In PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/2720407827.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/38548598920.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/84598997197.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/18043367572.pdfIn PDF document text
    • https://kawanmto.com/contents/files/xuwabafudupazuvewivara.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f5268104d---28401693001.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae547ecaba---43535780693.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc776460b7---48133592493.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/29986671239.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/kunifokuwomuv.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/somos.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/72248841262.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/49493805699.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/77bf954bd382a08bafcc27b61c311644/kazifiwurawevitadowijuwif.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/26538377475.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/xomefujomarage.pdfIn PDF document text
    • http://safarang.com/basefile/files/57223996149.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/romajorudugefalijib.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/16529816976.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/sojodusalubatamujemugome.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/getepan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=videoshow+pro+appPDF 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_off0000d8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10296 bytes
SHA-256: ef1a7cf1f603757757eb312b6e9dcef0ac65ade92424a53cd00478e151cdfa3f
font_01_sfnt_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 17900 bytes
SHA-256: ce7203a798909a3f2949ffd21e1b57324bbe5601084d3dc6dd79ab73b77579c8
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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