Malicious PDF — malware analysis report

Static analysis result for SHA-256 daae755a7891ff88…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 08:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0261aa8c7a7e3a99e9ac747e5d492e50 SHA-1: ee0255f0d9e41ade1a40c725e8a84f07a153c4c7 SHA-256: daae755a7891ff88d7ba73505675b6f1beeb1237bc35790e73eacf6fda668737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=hadoop+the+definitive+guide+5th+pdf PDF link annotation
    • http://kzlo.pl/fotki/fotki/file/22062608785.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/wujob.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/87671356059.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/9047541294.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/lomikolevuxenori.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610db218e4f60---voromedozufudafevimamuvum.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4c69a232ecd21cdccf5fb9e689f6a1ae/41830591987.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9f2c547737593be3500fc12da47b863f/37163102485.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/vusebavewafimodaxibot.pdfIn PDF document text
    • https://iwistw.com/upload/files/77945664417.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jegexu.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/69501564184.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/23709605792.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/f3e9348da9bf8f6487a2dceab5e3a375/62985819064.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/vobefeburij.pdfIn PDF document text
    • http://kco.su/userfiles/file/famadedegepot.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/17474857216.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/90528474961.pdfIn PDF document text
    • https://dhesient.com/media/kakilexiwulefuda.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db97b4660b1---1486332285.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/nopavoruwexugozeda.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec0a44842f---mudobamivarozepotozupeb.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-18-20-10-21-DFt0R9nt.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/d4472aa3f03e2476205ab10bd6afd888/27536556996.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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 19096 bytes
SHA-256: bd0b6fac04eb0eed8a1207de8f269827b17d29021064053a4a2715ce63827275
font_01_sfnt_off000112f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F5 10752 bytes
SHA-256: 1ab3925257fa922dd0ca369009a2f06de554d06e172976e13c044137285f59ba
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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