Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8e59b7aae693da…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 03:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aef2405881269a53250c99beea8b8454 SHA-1: d36fd6660eada45b9fc879ffb813da691716563d SHA-256: 6b8e59b7aae693da6356d311b2b05de5f5e4ee88108d040387252eff69372a89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body was unreadable, but the heuristics strongly indicate a malicious intent to distribute further threats via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1b5d69411---86879162381.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7ae514b360c375eaadb563eca1ce4a50/97496875491.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/2472879748.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/84248930310.pdfIn PDF document text
    • https://anfauglir.com/images/file/91716776979.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/remuk.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/61720941595.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/20408140304.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/68160793933.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080abc1cee---83961306863.pdfIn PDF document text
    • http://nova-auto.com/upload/ziredasawafivenumemegu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/n8653asavd0oja597ocfjs33v7/54706064737.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/kovatanedomunavomi.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/59738786676.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c417ab716---43454484465.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f000edb7a---35164414021.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/wimafavoxelunaduwokoj.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/jivuxodipufukuji.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/punobedasegu.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/piwakukowaseluxevipemuni.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/aa129a3bdd1f9f1ceb8777f0606719f1/61504319961.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ff89e4232---72021705976.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/kegix.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/lobibutazutubujavonug.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a8b36901e---talidat.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f9728a061---kisewatabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=floorball+rules+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_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10416 bytes
SHA-256: e9790e5bba3a79aa99188306b721ccf1cf0263e7695105c9e06f66795d436f27
font_02_sfnt_off00010acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 17492 bytes
SHA-256: 1a3ca68f478bdacd95c2cc16632ee6abb5293174c749e3f2b286e6fe73261586

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