Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdd2d7432ed5686…

MALICIOUS

PDF

74.4 KB Created: 2021-10-20 21:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 01404b5f0f1d1f5c0214b1a494338888 SHA-1: a1ec661fc1e319780242fd5909b14715d53e9caa SHA-256: fbdd2d7432ed56864b4f7d83a7471c3d98bdd4672b88b1c02b99cd4020ce2f5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nakatarikaszel.pl/app/webroot/userfiles/file/51578848596.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161653eb9c8849---busebimuwutajos.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tebuta.pdfIn PDF document text
    • http://toroisg.com/public/images/files/28356120474.pdfIn PDF document text
    • http://sissonne.hu/editor_up/13739707330.pdfIn PDF document text
    • http://gzpropellers.com/uploadfile/files/wibapuwub.pdfIn PDF document text
    • https://tenfci.net/userfiles/file/sowaxasarejitipofuv.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/kilanekonujositonip.pdfIn PDF document text
    • http://baove24h.info/upload/files/18127551732.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/vikeberiv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16161de2a82e0c---56874832821.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/19900685988.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/9009433720.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/80a4df196eb197e8e6c19928321cf9e2/wamojekexuxas.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/bakobi.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/6472232332.pdfIn PDF document text
    • http://soles2walk.com/data/file/xajorukuji.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/60625132065.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/pitaputojalexedasetolu.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/47802773100.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/14405755318.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/jusig.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/70978554150.pdfIn PDF document text
    • http://moretonassets.net/userfiles/60635848535.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/paposuluzudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=osrs+the+knight%27s+swordPDF 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_off0000bfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 17648 bytes
SHA-256: 9710497ac166f5d288c5ca3320f1a81820e42d6c29dfc6e0d909317583f36d31
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10556 bytes
SHA-256: 79ab02f884dbfffa4c610c7104d4cccbb1ff1aa5084e9c72a1046a7cb8136754