Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6cb9099434cd23…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 09:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddeac6922cc4258e74fba06865f921dd SHA-1: 9b6160342843481853286882c5f3d7bb65422ce8 SHA-256: 0f6cb9099434cd238f5684b4ab3205e8ccefa08144b956dd129868889986aff4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure malicious destinations. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coffeetuanvang.com/Images_upload/files/zuwuvaki.pdf In PDF document text
    • http://saikunghouse.hk/userfiles/43865004037.pdfIn PDF document text
    • http://planetamama.ru/files/file/fuxerelevud.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/zokoputusigazeborunu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/19176288529.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/rijidugujalarom.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/lijupigosexabirag.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed73ff0a77---kuvemotoborupapid.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/vibobawagudoxukefusi.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/87881269269.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/pokulojokovexiletuwupor.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/lesopewaborifibed.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/38108159258.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/5876876258.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613156444b9c7---fofugeberemurejajag.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/75201250013.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502a153170---bopetibejipotabugitozef.pdfIn PDF document text
    • http://aprt1day.ru/file/zufimaxuvivava.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/38911579242.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kuvex.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/31917601584.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/rotefujotebilolukomerab.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/87764307233.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/30993218744.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+iso+romsmaniaPDF 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_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 17032 bytes
SHA-256: dc2e89148abbe3f48ba682c782ceeaabf1e31f9a8921062936eefb8fa244869d
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 10136 bytes
SHA-256: 3d39948a8c2646827727234e9c6a6f2160e28ebc0ad31f3aeebda6c5fcaf19bb
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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