Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee4a9725aa7e147…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 02:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0158f79b09e5cf150ed027e283b5f2ea SHA-1: 09a2599d33608158131b42ac19b65d268184e35f SHA-256: dee4a9725aa7e147e1c4a29d15c0732eee90a0ce6d01779177f187e6bfb49f4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points to an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=tubemate+app+download+for+android+latest+version PDF link annotation
    • http://theorientgarden.iorderfoods.com/uploads/files/jadujidum.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/lekidesa.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/sanalazufusesepewoped.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130835004e14---92971010647.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/91631857260.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210920193743.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/suvoresaf.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/59744959060.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f0fa97e25f---63669241303.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/31416284250.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/gasimeva.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/9718120729.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc61ca907---daxemowimomewede.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/58186984299.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6083ef48c---92283117348.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/gabidupuxebegase.pdfIn PDF document text
    • http://skisun.it/userfiles/files/xekibexolerefebixe.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/27916803857.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/25771069148.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/45860507902.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b271aed92---vuwajutoxapol.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/72131480761.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/72563525997.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nopuwopumetafojewina.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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 15488 bytes
SHA-256: c7e0461d2c4b9c24f709843bbcb1d08e215a58f0acfc2d6da013c8d82bfbb3b1
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 11016 bytes
SHA-256: 51d8cc7a7edadb03146e49a4c307ce51f445ee62a4d9bc5b968c25512b579f3f
font_02_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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