Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bc1f8aab7dc8e2…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 12:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5ff7d206a3d5980e9ced0fb6474394c SHA-1: b1e02ef573192a4147056afd651ec032d1f7f8fa SHA-256: 19bc1f8aab7dc8e28e9202f74035845a38d38eea92c10c801616369b75fb3120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/383655382.pdf
    • https://iword.de/userfiles/file/bozejuwegini.pdf
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdf
    • http://www.thaiboat.net/image/upload/File/16835127061.pdf
    • https://botroul.be/uploads/95841165581.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/26788748657.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vehmv0uu8eqki5lhgajvlg1qbc/zaxojarivivi.pdf
    • http://huefpdf.org/upload/file/nidukulipox.pdf
    • https://thisissati.com/userfiles/files/76913564548.pdf
    • https://bloc-immo.com/images/6305423074.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/tasiturokisusamagon.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161467d9ebe71f---ropekoru.pdf
    • http://roosprommenschenckelfoundation.nl/userfiles/file/zirebebosabi.pdf
    • http://veterina-naslunci.cz/userfiles/file/towajebezujifojukiw.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec739e1e72---92186655273.pdf
    • http://pixel-pro.ru/upload/file/20611543077.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdf
    • https://amrapalispot.com/userfiles/file/wakekofawemejatus.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506218c402a---kuvumiponetivobe.pdf
    • https://edinburghpools.com/contents/files/wilogojowetadonanajagi.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-19/20210919015041646142.pdf
    • http://imhome-listings.com/userfiles/files/84233135163.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/3411206445.pdf
    • https://adoz.cz/ckfinder/userfiles/files/fivoji.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/j2ohj2h0653njdhipn8pmca7b1/sinokagatetopapab.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/ninozakelowove.pdf
    • http://7sate.com/filespath/files/20210915202835.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=wwe+raw+download+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b378.bin
2a0998e436ea08fbde7006d6cccc9de43547b7405fc4624e9cdabab9267dd1a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 14804 bytes
font_01_sfnt_off0000d8ec.bin
d25d429e2543d047539ac8961866eb7cdcf609261fd941c2e3fbfc9a44e63942
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 10196 bytes
font_02_sfnt_off0000efd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes