Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb443166807eb79…

MALICIOUS

PDF

76.7 KB Created: 2021-07-06 14:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6ae280884453e55def3326f927a1a2ee SHA-1: 01daf1cf730a9b573909cfbe31005acd7029bece SHA-256: fdb443166807eb794be6f9606624940e13192f63fdec1c7b947675edce1ad2e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=the+knight%27s+tale+questions+and+answers PDF link annotation
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/024809e95107801e49ad728f2425427d/latarowuzenugimutadiguf.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/zoguviwebijetogenowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e43171c38---bemumipigareril.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/33c746de239a7cab4903b57ae8a37971/53684002030.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/91283552829.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/91183641005.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/64829780040.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceeee2567f0---xogatitubinikitaletas.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe462a9cec---muwagefezowus.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/tikujorewusujifuzoxo.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/2036652925.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d2pqmmk10fitkf2ul6ttap2k64/66470927282.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/10500342426.pdfIn PDF document text
    • https://drlanda.hu/user/file/4172799051.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/39183497617.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced399b330---14116556813.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d58v2t53ar7si1ov1dl5e04l49/jutosijur.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e071a227ec---96962170686.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b36fb88501---17766685955.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093b709c1b50---deditixiteribisetumelu.pdfIn PDF document text
    • http://mosjob.ru/images/file/mopevumunipapijif.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f884c19b70---64635501772.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_off0000c6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DC 17028 bytes
SHA-256: 367d8828972ed7d4ab4d4cf90af7916ebea01b15e1ceaa8a23a7f79e8c35ac8b
font_01_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 10948 bytes
SHA-256: 3333036eb7cf7cdb68872edf5499c5eeadfb3d4969543e95187ee93e67a9c595
font_02_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.