Malicious PDF — malware analysis report

Static analysis result for SHA-256 4410f84fe157012d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 11:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 528433c8fefa1a0d9ca3cf8d68f77a2e SHA-1: 246720b2ac99bdc5b0d76f87baed851eab9ce7e7 SHA-256: 4410f84fe157012df89f0b2ff3b8a07d03aa1d161beccb15ed77022eb854db14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external malicious content.

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 http://yossy.biz/userfiles/file/37142116238.pdf In PDF document text
    • https://preciseenergygroup.com/media/1398365940.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdad12457a---komudanived.pdfIn PDF document text
    • https://securitydm.com/slicice/file/28499528267.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f590df36---dupanelewogekekugo.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/werumu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/23052236924.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/jijufajasajabidudolumen.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301811426de---17029152010.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/sarozutobofap.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/92689385488.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fivodededewaxolodunodipu.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/powewugubuwagoxozekexasox.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/96658981043.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/56181216860.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/wizifovubararolabeseviza.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/53630929715.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021910132664314.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/zajojafedaba.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/wojodiwupixowisap.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/533aee1a7c36ab593415a7084d2735f3/juxobosofe.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/15018148230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=friends+sitcom+onlinePDF 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_off0000dae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 19020 bytes
SHA-256: ef35dac2a90541ddd6f631575a74acdf41f00f4688299b353133dff422c0e3d3
font_01_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 10348 bytes
SHA-256: 8223b8eb576183427421f725b4d49cb84fa347062086f8a05458d9fe8df3d0e0
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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