Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9874f568c46a3c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af1f47a72b2d3502d47b17722167667d SHA-1: 07f11c83f3ef232e2b29e59a46fbe2f2a2504a3a SHA-256: 7a9874f568c46a3ccd8556a582b8ea8f376f8f1c5065e1a4133fccaea6b5bfeb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://orderleesushi.com/uploads/files/sukajasutifavizepisedabom.pdf In PDF document text
    • http://se-ty.com/uploads/userfiles/file/35270278735.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210902105244.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/8567172604.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/jufaweronenov.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109030409263574.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b6344aa3c---lulomumubabisu.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vubipodajud.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/wezavuwemo.pdfIn PDF document text
    • http://wych123.com/upload/files/51207081645.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/rutimabixa.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/16028426668.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/98281366641.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/202194232995516.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c58da093836afae26322b5ad86fc7dd5/zonomiximew.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/bilon.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/95961356838.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/79849722129.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/fowew.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0efdccea---loxigerubeva.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://nationalshield-uae.com/userfiles/files/40228289138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+video+chat+site+with+strangersPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 18060 bytes
SHA-256: 863ab33cf82a037fe59907354e2e2cf385286cc68bdf08e08bb3c75fdf4bfcc4
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 10808 bytes
SHA-256: 4bf5a86ef784e2574c320f873c77e76f2c520d8001d6dc6cd732c654e471c484