Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7138d217b7fce86…

MALICIOUS

PDF

93.2 KB Created: 2021-09-15 11:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2efbd42426439dedbe5233aa68274365 SHA-1: 50ea741185e1a1c5ad382ed602ced39f896d5ee1 SHA-256: d7138d217b7fce861385d3e843cbf8a2a9fbec36bd6eb5afc3810c561c64d325
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abcbyspu.net/ckfinder/images_store/files/jumosikilizebevumojed.pdf In PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/kirizujaze.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fa0e0cc1---45040315277.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/95486166586.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/71064906075.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138f3acb7776---tawoge.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/gidadotukipefukiraxajet.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/34613500135.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/7314791776.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nitefijirinagupozez.pdfIn PDF document text
    • http://nemochem.cn/upload/files/11692366369.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/bixawakif.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/xopos.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/88928091969.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb1d04ef2d---walelexu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b1725a34---basutava.pdfIn PDF document text
    • http://ledins.lv/cms/file/29080245072.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/54832077815.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138873305537---74529461250.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915150056.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/1035443733.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/63034106007.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/46937069978.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xeduripojopemaxerolobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=all+cells+are+either+prokaryotic+or+eukaryoticPDF 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_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 10652 bytes
SHA-256: 48ea4ec947e9d0399de743f8540585ab7356b14458f0f7638d23af595d6f4934
font_01_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 18724 bytes
SHA-256: 706e96b5916d65b3c6ddb5b8fea16581d094c3e1e9299018e380d65d36899d3a
font_02_sfnt_off00014eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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