Malicious PDF — malware analysis report

Static analysis result for SHA-256 23169acdf83313ac…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 04:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c1466a13466bd31448b0651a1fa610b SHA-1: d3502bc2ca439412c4bc900bd8c44b33632d5b99 SHA-256: 23169acdf83313ac77607837c7adcbab729834e0d846380d34b54ef3dd1eefee
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to potentially compromised hosting or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to obscure the final destination, likely a phishing site or malware download server. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://foxgraphics.paulsfashion.in/files/risaga.pdf In PDF document text
    • http://probeg2000.ru/files/userfiles/files/walidewifopefisoladimite.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f204ba9bba---40879432243.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/92916152945.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/36322454537.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/nobopewijezakutodu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/biletosupiv.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/67882374726.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a08045fa5b---28281623395.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/7491826054.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0b5632962b7e48723839ccda4431870e/pawolakalurubuzela.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/gokopotajuzutifi.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/gokeginopozufafari.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/12702612146.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/99834532535.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_126D7F8583721C98.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexedakojajaku.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/axozafanopaparuxexarati.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/93391510648.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/segojexup.pdfIn PDF document text
    • http://xsteelstock.com/d/files/22872986890.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/buwikiv.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/43047564368.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sapunepubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=probability+and+statistics+for+engineers+and+scientistsPDF 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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 18292 bytes
SHA-256: d1da62fdce8cd6b5f729e02d67b72b65a7acd6bfd3f11c95ceb63a2db3bfa5d4
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 10908 bytes
SHA-256: bc2c9a9ce41229794c6eb90902b9e774424bbd40bb7d2bc1d25ac628fd1f145e

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