Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd1278ef2549c9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 10:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fc9617cb26be562dbd30cff3bfca1fc SHA-1: 7eb37264788e6b49b657b5f354655c089ddf6142 SHA-256: 9edd1278ef2549c9a0c3d1c4e9699d956b7a662841139167c3eaf6db4c7cb1f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://balletpanov.com/uploads/files/41259371225.pdf In PDF document text
    • http://yacpa.org/yacpafiles/file/39320967876.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/xawemexitonilikavu.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210703_F8B1934AD3A60667.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/91652a601ac3761f2103ef6de0e3dc30/64033261810.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/97495314490.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1611eaaf6dfd01---78965856095.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/asuonmv6ir866pvf02c6s9hju6/bevovosovakuwisaf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/4042306999.pdfIn PDF document text
    • http://lachina.cn/upload/file/siwebenun.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/72094391510.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b06366c0---62382425773.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16a1351c4---dinogelazovifabaribekom.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aaff2818c95e2c1ee039467cf600313/dovimo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/witorakudiwires.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210801_112420.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/70805748880.pdfIn PDF document text
    • http://houselandia.ru/files/91534298667.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3k3l305t3l85r63soi7jqv9802/66355086172.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6450a7812b---74047736712.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejaxen.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6293ae77---86053208900.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5222ac5ee82050cde99b9c81b5758729/nukuxujilalewiwagafopobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=comparison+of+adjectives+pdfPDF 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_off0000bd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 10964 bytes
SHA-256: 590407472eb72a06c15c647f96e5159e2244be98c43b62bf957602f6c209d20b
font_01_sfnt_off0000d6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D1 16300 bytes
SHA-256: 26ff9710ad497c2c6d71311189cd07a75197d151ed13a7b72884a8ed13ccfa0a
font_02_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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