Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1809e4761faf790…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 09:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d886d289ed51abe47f2f9e165063f28 SHA-1: 2f3878eba8e43d79b0b6652b5b4ae3bd5edf0713 SHA-256: e1809e4761faf79058752882268674eec8f789319da87147c65c60942dd65cb3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=mov+converter+free+download PDF link annotation
    • https://luckysurface.itweald.com/uploads/files/614b9b4f6ae82.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mabamof.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210912_5F5C4936ECE8ECD4.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/dopawuwufimofaj.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614476245c258---78041102289.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/susamivuji.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/doxuvu.pdfIn PDF document text
    • https://kingcom.edesign.fr/gr33/web/uploads/assets/file/34232539426.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da1b418ff7---sigevepirefes.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdfIn PDF document text
    • http://tzsunup.com/upload/49820066769.pdfIn PDF document text
    • http://indexone.ru/upload/file/57173375380.pdfIn PDF document text
    • http://teifsepahan.com/files/file/37239978453.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/potesezixixu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/fepumov.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/bovejidinazuj.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dc1e9f26e---57163870219.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3fe5a6abe58f9db74db047c03ee604da/87669711137.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tegafevupibod.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/20130748701.pdfIn PDF document text
    • http://apex-architect.ru/images/file/51780859388.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20219116742740.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 17440 bytes
SHA-256: fc4fc05cf22ab53f89be312aa7d0d3b75ca868025d68078acfa7abc8d9e998a4
font_01_sfnt_off000101a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A0 10352 bytes
SHA-256: 107be8d9caef19770d54b0b107955a9712aca1177b72c419f318e4f118b7330c
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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