Malicious PDF — malware analysis report

Static analysis result for SHA-256 8636295d1535bd5d…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 07:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 25fccf19aa7124af57c44208ab6f6ab0 SHA-1: edd07fdf71a1f52d9480f3d047082a74ca910c5c SHA-256: 8636295d1535bd5dfd222efb5cc61ff1323aabe8ff3609ec788a03223d9cda2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=a+to+z+capital+and+small+letters+pdf PDF link annotation
    • http://slhs1958.com/clients/18590/File/lumevutuponevafizafovewu.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/refapazuzisajodajanul.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/nokosiwokaxubarinupifap.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/gejoxu.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/79349994303.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075e373dfe1b---fojoge.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fbf32a9c---bebevusuvevitobebi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xupitodivijir.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/42238437427.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/55504400854.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/jivifafugowimat.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a2734a172---41226781955.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/fojumusogalufuliwu.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/99845916505.pdfIn PDF document text
    • https://cecprint.com/images/file/sowiwovufe.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfbf70b330---lokupuzepofuxuwinaluvefaf.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160859e6fd0f6e---62224697008.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/robeju.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/pefobaramixezilijeremisuk.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e3530d87512---jarupafupojibivefupo.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aba6b1e93c7---kasubafibow.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfd4e9d27---wilokafajomabo.pdfIn PDF document text
    • 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_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 18420 bytes
SHA-256: 388b71794555d46ecfb53e3ca9dc61b938c628bb52c491e8d2ddc831a0d402c3
font_01_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 10824 bytes
SHA-256: 9b9fcd7dd37c71dc7dd38ecfb3adc92d3901800e3eeb0559ee2767e738b77abc

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