Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbbe537084b4a89…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 21:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50307a2f26c527653740c0920ed6422c SHA-1: 6863886c0fc9dc4497af1b1feb12f63a64b2cae5 SHA-256: fcbbe537084b4a89d5fc730015d7376ebf247f83699d29f4ecd946c008186b65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=watch+a+quiet+place+2+now PDF link annotation
    • https://noriupapildu.lt/ckfinder/userfiles/files/januvenisonokim.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/64751537778.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/31219869530.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/xekitubasamuzejuwiko.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/jusuj.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/62943197829.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14158549753.pdfIn PDF document text
    • http://hzqzg.com/d/files/wupekalavu.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/kugul.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/xugobapirofudagofili.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ee257400c2d2e8099b2184e1f5d8c468/89870373011.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/56988315642.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/r38mq2qqk6ulkpbp19ul05uvaf/92333145701.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_221457.pdfIn PDF document text
    • http://weingut-suppan.at/files/11913210999.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/384e70bc0d238d92351ecd74ac6e7d82/60807897340.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/82352425465.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/sutawixeni.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/10857920666.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/06d69b2d3c1c386890716b87644dceb6/87041939764.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/22858819712.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/71977007589.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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 18296 bytes
SHA-256: 935d558f4428c0bb59bb82dbd6867e65b8ff0ab8baabc662e8ad86f41d5dd164
font_01_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 10648 bytes
SHA-256: 1c778c948402f38bc16da58f636758d4ae4268da0fe7c7c1222c101ccd749b9c

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