Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dc4ee027d51747…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 15:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f6ebc81588c380c0fb5a4b4425069dc SHA-1: 83c9885146d93bc0ee889916a662cdc8cf087c4a SHA-256: 22dc4ee027d5174722650f72f19a7139416545bc6d275f0d5f6b3d593551024d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links are likely intended to lure users to download further malicious content or visit phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a6fdec21766feacd669ee16387bc9375/48479117196.pdf In PDF document text
    • http://finalbrand.cz/upload/file/77921815556.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/33225473221.pdfIn PDF document text
    • http://consade.com/userfiles/file/1671480726.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/31503635536.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/15230803479.pdfIn PDF document text
    • http://renknh.com/ckupload/files/96179224459.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/76710115232.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139b447067fb---gewofisaxavaniwo.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/96444425628.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/tosijumezatopoxe.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/pumipogesudopalakaxuguvif.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zekeviruwobapugamaveneba.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/87165632663.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-1/20210901094649241508.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dapifonorusot.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/39663217216.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d953af6620023059af03e44142dcbfe6/57054343963.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/makovoje.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/baviwonas.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ircjdnh8ca4s81j651ol8j6b8s/82531900897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=record+and+replay+touches+androidPDF 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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 17724 bytes
SHA-256: 663bb87819da63931c23be7d205924cf23294dfb270c2171bea4b339df6c9253
font_01_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10872 bytes
SHA-256: e23598e98e6175fb3167f34333ce369118bcccecb7462d8860af76b346000f0d
font_02_sfnt_off00011a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1