Malicious PDF — malware analysis report

Static analysis result for SHA-256 8215e19bd833970b…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 04:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89a5b54b595ac43f7476d93d2ae53449 SHA-1: b2d9aefabd5717f2ba310e0a1714c317dbbd60c2 SHA-256: 8215e19bd833970b7529c5cd1d6c561e73c9107cf7b5e991acd4bd4ef17449f7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to PDF files hosted on compromised CMS upload directories. This suggests the document is part of a link farm or SEO poisoning campaign, likely intended to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=lowrance+elite+7+hdi+mounting+bracket PDF link annotation
    • http://u15.ch/ckfinder/userfiles/files/gawopoxifojazumurasin.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/7239502097.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/ritupuwusijedoze.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abac3761b39---jovabarosel.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/2039659857.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210727/210727210346381496xx5sdonpw5hd.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/87b91c42bb4387fafae08d1817134657/namilerisabugutep.pdfIn PDF document text
    • http://blueyee.com/upload/file/221848561262.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/vizuwezi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e48109b884895b6c0d7e7c90599b64c0/53415202897.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160deed8f93aa6---66950594481.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d053f3ed09e---82935300084.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/95629cbd8badcb61d4902371b8cc9b90/88323351084.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea5de843b---zojabarabodus.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jivixirulirawuze.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608633f050a3f---najobudokaxifenujetes.pdfIn PDF document text
    • http://4bx.pl/public/file/55381785922.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/labimuz.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/nunuwulimovifidijopefogaf.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a423c763af0---roloz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8640a83ce---46254658949.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/16797577928.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dc0905379---buvakakamujemopus.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xovinovewasaluluxu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a0bc4204a91cf724d6434bd49e034f91/kepasodokizajamag.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c26a4a8eb53---pusuvi.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_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 18468 bytes
SHA-256: 1a8a433fffdbb5fef2077921f6bad4124acd4e0555e4c79ac1498721ee261f37
font_01_sfnt_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 11072 bytes
SHA-256: 8926c7bf49ccb3dcefd8a15dedf338fde3184a3c0940ce2ff6dd54e3ed740ac5

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