Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baf843450c6e47d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 15:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd2948a626e9350e6eaf1cec3fa34fb3 SHA-1: 405a42d6b710435b3cd2d4d49e57ea58badfcffc SHA-256: 6baf843450c6e47de50e2ca2f5c51540497693eea29815fc03579021b2e655da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hanyangsteel.com/files/fckeditor/file/1571329813613d8241d56f2.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136178972c02---38580040707.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/80923912311.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/4354366328.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/h984m7adf2393ku1a953cuppu3/35617712332.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/zudazu.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/judojegedezevedetutemek.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/toxegowagaturitovekeduto.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/19005051264.pdfIn PDF document text
    • https://patc.fr/imagesfile/42004156239.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/kivazetawusox.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bdebd1d13c254736f4311fd3fe13222e/nonavutiganatubofaseraze.pdfIn PDF document text
    • https://simorgh.it/uploads/file/76762182984.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/jalet.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/88635392757.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/gopitejaxonijij.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/eba79fc70698a8d94f54903f2d7c86c4/13777327448.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/gisejosogu.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/wumeliwosupujob.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nesof.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/87560443211.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/wopemubozugemewadefemozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=sense+v2+flip+clock+%26+weather+premium+apkPDF 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_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 23680 bytes
SHA-256: 8e8f589f4db49cd69bee4a8538f65a185071b3ef35a7bd5f184980fb3bce4f65
font_01_sfnt_off000117d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D5 10464 bytes
SHA-256: 829dbacfbd228e9338b71989e10014d4b41ffeb38f8b9c84a5fbfe611b88ff8c
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1