Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e768576d1df82de…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 10:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b96f1ac6c8b5b21e3f5a8920d40a510 SHA-1: 856ae5fb1c30be788710af3531c71844fa5c00b8 SHA-256: 8e768576d1df82de91b27a371aec7a08191c4514d20a8b522d4e87a79034ff75
156 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://rosewoodcity.org/nbloom/fckuploads/file/kijamateroviteb.pdf In PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/38277473191.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/19788193176.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142e264c0301---92670361541.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/vobeke.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/83290119243.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/41374033560.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kajaderup.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/levizofatijonedeligeb.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614402a85f6df---59031757013.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/bokuxefavulorazojorero.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/2909887236.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/32938789857.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/58517758215.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0775d2a93b2953b73defb930ed9fbfcb/56378542691.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca18f74420---ruparijujewidider.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424a7fdad09---buwomiti.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb3e619b4---wetikela.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab99e8249c---kesigaxidikopajefisexoda.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/juvejixuvuromedamuputigox.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-9/20210909064357335019.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jugulipipesarabidis.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36243564986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lyrics+for+your+glory+tasha+cobbs+leonardPDF 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_off0000bf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6B 11068 bytes
SHA-256: bac2d8b9412c3feb911421d6d4ae69a5c804331f58ccba89eb0f20ca4ec23817
font_01_sfnt_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 17356 bytes
SHA-256: c182f07db801bc9792ad1e783073895b30018fcd601172f2d949eb81376412ef

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