Malicious PDF — malware analysis report

Static analysis result for SHA-256 083924324a150906…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 19:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12780170ae3c8c7a94a6e536a73ee1ab SHA-1: 968211448f7cd7e3b9af84a2709b955221108c6d SHA-256: 083924324a1509067d7b7935c9eebfa69bef875eed701d07e8029c1c4f6ffbd7
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The embedded URLs and link farm characteristics suggest an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=bios+ps1+para+android PDF link annotation
    • https://baxsporthorses.com/userfiles/file/81271767560.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/69974253736.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xoxavisuf.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/bofomidofufeziweteda.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/zedulemutisivegomel.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/luwejujogameguzazalebun.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/38142936453.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613651de18060---16006666707.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/lasetudujamawalawij.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bufadapuxuzigavik.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/36942995748.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8b55004aa14fc278e3d95cb7cce34124/tawizenavibewovotomodop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337bffaf7ef---tokuzilexejomudiwami.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/zexodusodakurelopuvom.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/48258356940.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/58033407629.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/19325690840.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gafelelapesokabekagipifuf.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/45430630381.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/65722923936.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352e86b5ce---jaderozetigepabutugapewa.pdfIn PDF document text
    • https://ibericadearmerias.com/file/47722249772.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91e900d07---13074095070.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/98868830409.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 18032 bytes
SHA-256: 384aee2d2a5ea197149440f2383f2be5b6b71f0157359a2c5b208133f64cc305
font_02_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 10216 bytes
SHA-256: b26feca1de284193c22464b9b17f09b8e1da7e6abe289b43d32aff8b2306e18e

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