Malicious PDF — malware analysis report

Static analysis result for SHA-256 c336199046ba1f07…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 14:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14a77440839d0387b6b6368082725df8 SHA-1: 72891dea5944614f76cb9bf9bd189d7e8c3d6ca3 SHA-256: c336199046ba1f07ff58d8579e274e92695ab8b2d1fa583be81c50df6ba1e246
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614807d4d5f7d---mepuduwasutezexusolit.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/34092264070.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210915175746.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xuwatitanemesaril.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/7908834404.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0921aba66---tadenunuduxifubejelag.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161417a1a1c61b---69699628072.pdfIn PDF document text
    • http://rilta.net/userfiles/files/64733211769.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/37831558025.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/29650459935.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xizupuwiwisebet.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/249e0d8d9671ad0dc9c7e445a5f97001/kazozapij.pdfIn PDF document text
    • http://surestegc.org/documentos/file/6262750639.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/meritevafepogofanataba.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/jidezenirikobitijek.pdfIn PDF document text
    • https://olterus.net/contents/files/98067161631.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/44171362199.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ab94de915fe3a5b4b5df2f2dd7d4e08/9192230144.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/xevozazekoremixesip.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/91671623449.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/zurutojumobaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=pirate+boxing+streamPDF 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_off0000c871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC871 10648 bytes
SHA-256: c8fb3c665a23e2b8d89fb4838d8824fd5adb5bfbbe93e5d3847bc84b109fca48
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 18052 bytes
SHA-256: d124281f43421ba6ecf2541aa93467a1342d004d73b92bc964e237b1d8a0b0ec
font_02_sfnt_off00010faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1