Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e135b120e95f7d0…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 17:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41321ec6b48a06a20b21f844b32c22ef SHA-1: a53b621fe2f8793710a4c71fbe74c0dc86113595 SHA-256: 2e135b120e95f7d0105887f8f975d9e3052ee6bc938f14858458b66b783e2848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites 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 distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vds-construct.pl/userfiles/file/49336732159.pdf In PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/74848035654.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c758241993f02af5c8d4c26d62732d07/31765781143.pdfIn PDF document text
    • https://bak.vn/upload/files/40353682767.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5d728c8b31dab716d468f8dc111de4dd/37302457438.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c166aebeaa---30493612875.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/tudewowoletaj.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/53447093469.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f05ce0e0---30896502099.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/23113777448.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ff58149d---fegodagomugasesavir.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d7191208e7bac24da004d1e3909f156b/simazawimivuriluditeka.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/nareledativudasazuped.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b71c3e668---konasuwonuxezefub.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/zevobixuzuzimonafeguwo.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/fggu9atvksguger3hjk69rleoh/95858539776.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/dovukejumuzazis.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/bnmgfhmacegpek4u6m9lehvi15/57649323961.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/femetanukugoromijato.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dakiwevodero.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f2873003740b97687465bfdcb21f9bf0/16309382881.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a56affa2993---70618063662.pdfIn PDF document text
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/24205495402.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/rk8iu90qkaqmvahn1gheqdm8ul/74463971461.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/589222989.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d829e3f10f---gadutezaviradomuwuzepad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=helicobacter+pylori+nedir+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_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 10688 bytes
SHA-256: be59f7f9f722c3e570cc7d9f7743119c8547a57d8fb7b6c3dc22627af384a276
font_02_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 17356 bytes
SHA-256: 32664ba4c72722d42fe59629e6eb7a7bff42948761fefdd854a428109230b604