Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfcf7732105beec…

MALICIOUS

PDF

75.1 KB Created: 2021-08-25 02:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8dfcf8e959dc91a4bd6e4e89e0d0792 SHA-1: 4a6a716c79358886d77766eed406feff6e3e8c2e SHA-256: 8cfcf7732105beecb83e5c31e74b726e2de3d7b256d12891c3c881af2ceb69f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crm333.com/documentos/file/zulirotefekakile.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/tuvogufowinuponabata.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/95973526821.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/gomonorabasesowofonabewi.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/kopuziziti.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/47331996879.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609851c7d21aa---dedajiji.pdfIn PDF document text
    • https://hirurgija.me//files/1651184739.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/31223109442.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/87454526785.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xajejakulekonexamulix.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/jexifif.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81323cdc4---puwofasinu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071bbbe2e388---68590205076.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/jimodibasa.pdfIn PDF document text
    • http://sdds.be/userfiles/file/19117807262.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a6b304de9d0feb880ba3dca8507fcaba/kowoxiviraxo.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/56710788753.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/403909780.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/sifaxanowesoverowobo.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36054738113.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/banajisisim.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a28d1d5612f433fb8e8f8763255cde72/wofizufodetibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=corrected+gestational+age+growth+chartPDF 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_off0000c2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 10764 bytes
SHA-256: 40d0fcb2bcc66d6732a7bc92651a4cb7bbd9388e9b6f16a61f7d033f408e20fd
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16400 bytes
SHA-256: 9d6ef8138a62f23a89cf8f75a3a6a150ee913a613b93a50a4cbf39c4ce959cae

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