Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f57dd70ec7bcbb5…

MALICIOUS

PDF

101.2 KB Created: 2021-09-07 03:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f498d86b38393519fe16b6d7d24d8974 SHA-1: 3f701bb0bfad6828dd106df02f17de26fe9aa8ba SHA-256: 4f57dd70ec7bcbb5e3ed23ff1f70c5262a403c3814e4ec087d28c7690053e97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://kursadowicz.pl/Upload/file/dexovonake.pdf In PDF document text
    • http://fbhsclassof70.com/clients/f/f6/f6e65d48c6cf753e26882f86001d336b/File/52098385771.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/28208583594.pdfIn PDF document text
    • http://cocoal.com/uploads/file/vomuwexotodibonezelisun.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a56566a3e85---gujoroforipil.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/74273910586.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/68528722040.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/tidesepinewojezowug.pdfIn PDF document text
    • http://goldmustang.com/files/files/tarivakozikewu.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gumepew.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe82d9bdc6---tuguwet.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/fabudajesixokudema.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1491f7cca1c62d73334f92f0fb977900/98609670899.pdfIn PDF document text
    • http://slsnn.ru/content/files/54559493344.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509140738109597.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/degaruwotojisafejegeni.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jozuzakitilujumusisez.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d30d43a77c8340e0b445ed1f17fe6d78/8518652647.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/nemunuvalabusepegalugi.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/bomajokatupogu.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/57598992493.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091829a5e70a---zenininutitimojawaz.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/42314350984.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/19683924939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=curriculum+vitae+sin+experiencia+laboral+18+a%C3%B1os+pdfPDF 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_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 20580 bytes
SHA-256: 6ead86958bee7332bd5e5752bc16937d4b7dd99fb556c822963eb26b9aec60d3
font_01_sfnt_off0001504b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16862 11688 bytes
SHA-256: 3bb0cbe4a02b70253641c5063842c6c6c84afb87b79bfb3a6e1e120049a0271a

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