Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f66cf7abd49d31…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 00:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e6287af877769be8d53cc7ff9725e93 SHA-1: 906544801cb2883969df0cb4dca32bc0fdead174 SHA-256: 94f66cf7abd49d314652a0aea0f363d47c74e42206216d7f76110597f506804a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://juditphotography.com/picture/userfiles/file/wofezugozewatatowimetomu.pdf In PDF document text
    • https://dailyhondaotomientay.com/upload/files/48488280853.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191356335430.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc13331354---gawapaterivowo.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/xoxemutawituxilazi.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/69599829191.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9aac81196e9f903aafd1bd5f692f0da7/fefom.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/11194978429.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/70643614382.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/75462399681.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ek8g11e2tskcl2i3k2nsiitot3/42986515184.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210910222120211002m5bryf3glo8f.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/25449171648.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/69645083395.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/soxejulinotisilezifidi.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/nelajeliru.pdfIn PDF document text
    • http://citra.cl/userfiles/file/30320084939.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/45041177850.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/81908447769.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/fixaguxupuwiwodipuma.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/97672017535.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/27327490431.pdfIn PDF document text
    • http://mcutech.net/files/30970272852.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/zunujikopafanena.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/85377691262.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210913052104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+did+they+build+houses+in+venicePDF 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_off0000e5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DC 10704 bytes
SHA-256: 4e37452524535c6c6513e0191a536cc209a9c2b2bcd416ba1b162ed499e1b8ea
font_01_sfnt_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17000 bytes
SHA-256: 9d66d40300b7932939bd5c1982d46c5f7cc45f6e99c7be62a7dd8baf11af6f60
font_02_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1