Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada4fcc615d31a22…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 17:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 06d80f0cc71c25de0bccd3e143a9a9a9 SHA-1: 5d1dfaad8f43e304bbeb3423f1b7b2fdb1fe1f57 SHA-256: ada4fcc615d31a22ef4b0fae38bca4c4b1d2fc3dcea98bb1d5ce023a35b3dcef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cbcom.eu/ressource/site-image/files/vodorusezuzezedibifed.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613887dd3a63a---32592109314.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/27203591470.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/26524095299.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/pavexunusotijixebasez.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/sudosoxawadoloduremo.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/viwuxifexalaje.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/54860017802.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/84681993481.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e43739fef---tuzumutusoroxegumijix.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/norezigufuzawavokiwogagus.pdfIn PDF document text
    • https://harmony.im/userfiles/file/18984791431.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/55234257442.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ffe93bb266ba79338ab7f361b893f1c2/vavikip.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/64730216845.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/66112039581.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/56445244500.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/dazemamu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132057dacfc9---kowanisaxowijovi.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/sexeba.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dobopasedojamadeverik.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/laluvofanev.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/85653236278.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/wopeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=yify+movie+netPDF 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_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 18740 bytes
SHA-256: 19c22291ee01642d068deceed31c5edc8b6daa75a2477305368c25481dfa9c47
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 10064 bytes
SHA-256: 1eff7ef83e6125d1ec7eea3214b8061b2da71f6e8c93711cbace51d76d297353
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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