Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d069793d35c9731…

MALICIOUS

PDF

90.9 KB Created: 2021-09-17 09:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fdc74bbbd095366fe944687f09384a2d SHA-1: 545ed638dbaa565d682b4ceba521bb65fcc36d3a SHA-256: 3d069793d35c97310037b52ebcad62dc01cafda6262136f2660beb648052fbac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/tutabewujadagib.pdf In PDF document text
    • http://insuralead.com/userfiles/file/babimefatezetexeravulirat.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/43042857148.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/87886917735.pdfIn PDF document text
    • http://imi.vc/upload/files/ximovudewijumovafukenipu.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/34493082543.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/85725948899.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/9221318602.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/60382037849.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/pudejosabewowiz.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/16668721458.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/66911787851.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfe1ca4e1b---40104510490.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912083807556242.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pabibukutudirivuwazib.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/61171194443.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/17387363176.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143ff80998ee---21408373456.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/50780614294.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/lararudala.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/fivugekuviwizokikezowa.pdfIn PDF document text
    • http://bwc.lt/i/nifobivobu.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/bidon.pdfIn PDF document text
    • http://special-pharma.com/upload/files/vagirojemubofokekilele.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/402dacf9e176903662830e54a9f4208b/29698802819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=super+flash+2PDF 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_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 10336 bytes
SHA-256: fd7902c31bd62ae38c3b974e11b44a2ba37c5fa0f0cf284b57557909901d497c
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13208 17116 bytes
SHA-256: c9f72ae7874548a9a73bb2a1015a06ad655670f4e1c726033911c30314a75e7a

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