Malicious PDF — malware analysis report

Static analysis result for SHA-256 808be26059150799…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 00:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d98f4b97459193979eeca23f307ea019 SHA-1: 7a18915901a90822611769105ef789919b3905b7 SHA-256: 808be26059150799bb361e402b4c99596f0a425fcbf63a5feb82ece4805b68d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=android+programming+google PDF link annotation
    • http://alpha-th.com/userfiles/file/repad.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/46753004401.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/78294846137.pdfIn PDF document text
    • http://mextro.de/upload/files/63078776.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/24473050239.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/zijulonetewekesimap.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141ce6707433---40003489554.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/dokafosidexolam.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/ganojub.pdfIn PDF document text
    • http://weldingplaza.com/files/file/zirud.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e89fn837brn21kuvq7ii91hjlr/tunikudu.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912094621.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/16697342859.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/59741878731.pdfIn PDF document text
    • http://net-marketing.hu/images/files/rorasovurejijagewojizo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/o8tfeik31dhqdkvv6u8anu9jn1/xefatozar.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/25152093106.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/87123698336.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/kilure.pdfIn PDF document text
    • https://bloomeng.com/uploads/xexigaxelafebarawugimajej.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16143dccfadb1d---36367533629.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/66921832729.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091819190673.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/55468140411.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb16aa97a4---24234164253.pdfIn PDF document text
    • http://mcutech.net/files/bibobato.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10452 bytes
SHA-256: c2e0f0a4d6042f2b59052c89322e3e715c33e2f491394c5679b05b63be43609d
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 18076 bytes
SHA-256: 01453ce45361261858a7672365c08f47bab081a9e274deb01ecdc376189234f0
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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