Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36573c0d49c113f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 17:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f1b0c840da44fe35f4c19cab9c16277 SHA-1: 5acc4055992802641db8c477e7583f5e85147425 SHA-256: b36573c0d49c113f070e0c4070ba839c01bdbce7c026881c13fb9475412115f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm and a lure for password-protected archives. The presence of numerous URLs, many pointing to compromised CMS uploads, suggests an attempt to host or distribute malicious content. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://cortemadera.com/wysiwygfiles/file/7589149828.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d9886e9n19hb31rnnih8pspce3/sokolo.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/neliwubutujoxizemoji.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/zunofulamu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/da1e1b5387028082f87ffeec2ef708ac/mizuvixurokedezojaboxuwu.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/070402483092.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f2ee90a4affa48d07041a7cdbfbcbf/70232038491.pdfIn PDF document text
    • https://iwistw.com/upload/files/11497136892.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/43c931271db406e50d70e0402c5bcf36/wulojigama.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c360621bcec---zirovujevipevif.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e9ab15c192a0272e6949ed3f17e2ce9d/sapuxilowoxuxukusukur.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0b8d22da39dda2f17bb32449d2dd3c7e/27665628564.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/86305315502.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4100177a9c0b829bf7c912cd294faf51/wiwamatiru.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/73887939937.pdfIn PDF document text
    • http://soon-xin.com/fckupload/file/23024820386.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/zimiforajuvabufenetu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1c2269b41f953b799661a26ca3cc8fc3/63945424441.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/24635052347.pdfIn PDF document text
    • https://highrise.pl/file/13765888171.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888644638ec---50254014126.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/20492175851.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/20804489620.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/61911133911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=password+protect+pdf+osxPDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 18780 bytes
SHA-256: 8cbc6e37797886e08831f1367ac7c33dda1e98e6ad3d12c3a1ac4d93c2492bd4
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 10560 bytes
SHA-256: f94e77e10e1b838515c1f57251af3cbd542366de9c03732fc8a8e05da4beebb0

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