Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc96a4d88f19aa4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 10:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0024060121ecc53cf66c1c376e67a0e8 SHA-1: 115dd5f6da2bc9a8bfb5d659439287a0b57b2498 SHA-256: 3fc96a4d88f19aa4c3bfcad5a11e56a375dfd93c5f6e5f5cdb4ebd2082ea0d2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=perforated+duodenal+ulcer+complications PDF link annotation
    • http://isvpro.com/custom/files/48439992729.pdfIn PDF document text
    • https://agermag.ro/mm/file/felizawo.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fafex.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/88b2b90c248ab0d6e18b3ffbe6f81208/powopawawi.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/marib.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/5258650672.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/74510115586.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/85522351617.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/73654403276.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a1f638f05279c69023fe3eeb4440e2a/9611793747.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0c2c5355bb75cb31ee0bfb2cdc3467ee/82436826059.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc26d6b4b0---37736130707.pdfIn PDF document text
    • https://invest.pl/userfiles/file/84070470773.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/20618515845.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/lijemavenupomubikiwamowib.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/032cda8d9a3ff6e74fc7bc358fa6c087/zupixagilevezitupisedu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98607756991.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/xepiluxemo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612100196ea77---rirevuv.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wobaborifavuta.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f3c22760---80080754758.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/791b31dc9f0fff40b602f2750f1e7342/30724007546.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4628b5bea7---vesojidedajefuj.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8afc164f---53881474924.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 16472 bytes
SHA-256: 10682beebd08c22d85c4ec8027f83765ca18364edd4e4efa12bd6bcc01f1f1e7
font_02_sfnt_off00012cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFC 10884 bytes
SHA-256: 9399baa0e34170c561f5e1fc84b061311c1fc002e329260d58647697e60555d2

Open this report in the interactive analyzer, or submit your own file for analysis.