Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2802a766499f990…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 04:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9a60445457af9511005533fbad3905a SHA-1: 11ea232a7ee43f44295c87ee7904eb54dfeee824 SHA-256: f2802a766499f9905149d13193ba54d9d68979de305fee3b5334ce7fea3a1e85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thermogroup.ru/uploads/files/dinixenaziruv.pdf In PDF document text
    • http://lagerunda.it/public/upload/file/gopufilexu.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lavepagok.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/68426330341.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/zibipavamafirojebawopo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/veropozarilituvawuvujivon.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/17955690158.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/revadage.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/11832047625.pdfIn PDF document text
    • https://ibextrail.com/editor-images/84588853839.pdfIn PDF document text
    • http://3sdent.com/upload/files/88481809445.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/nivakezivuvawewifuko.pdfIn PDF document text
    • http://terminsk.by/pics/files/dudinoravo.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/78295475890.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/derusow.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614e15bc101d5---2409928283.pdfIn PDF document text
    • http://webs123.com/userfiles/file/77125212686.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/vudemulezig.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/1fdf939c7a749fe15a5a88eb8e7ed3c9/wapafaworowaxesejunirar.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/46152009874.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/vefevelafonofavavuja.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/65021208831.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/kosigojuzegijadawuzipi.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/mopukuvegu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161435e1888bf9---takunasos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=original+kamasutra+pdfPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 15496 bytes
SHA-256: 2513a739e7094d359dbffe6895da45b1729a66056edbbc171d428ba3ad012e06
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10804 bytes
SHA-256: ae3d1080389033a2cbad58510a8eca98660c9369d077bdf536872eb6e1047f28