Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dbcab90191c52d…

MALICIOUS

PDF

90.5 KB Created: 2021-08-06 13:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb20f816d5dde5427be639e3dbd66f8a SHA-1: f377ef9f4131c951d8c48dd61a138494e3f486fe SHA-256: 72dbcab90191c52d4dcbe501915f3003e384ec2f085c2f29483feab475d16b1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious or phishing content, a common tactic for distributing malware or stealing credentials. The presence of embedded JavaScript further suggests potential for malicious execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://archism.ru/uplcv?utm_term=how+to+make+things+on+tinkercad PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7dae33fa82472504719573659fda6e87/74835929874.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/xijowipep.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/a7vqcietub5v6ijl2fbb5fo81a/85736163415.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/guvesefoximekelolamuzigo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7a2afade77d1ebc8e3285f3ff92d998f/pivulejalawa.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/11339843120.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/xapitakapelukifuzupopu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fed53bc9156---fupebuveteridetele.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/ruperagugepok.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed8fcb90a8---gelilojavowuvof.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ffa9131d4---pasejiroleleguvez.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/39477176452.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5ca6b79c---54552045286.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7f96330fc393bee05241708bd6dd00e7/74712238811.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/japojirelibudidokozugamu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/av3s729sms1i5l4gc3dd5b6l78/wadezijinetebigusasajurin.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/96549041512.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa024dce712---46508832080.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/50483336990.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f249e6762---sunukumizawo.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/lugusuzemututo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/pugapunonunesopomevepilak.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/ruluragoxozekadizig.pdfIn PDF document text
    • https://businesslife.com/content/files/2595493543.pdfIn PDF document text
    • http://keitbg.com/images/files/gododojinunagofagowumub.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866957f36a7---1300190635.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_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 10940 bytes
SHA-256: e4325e771add9e80c1d56f3b7800dfe230e2ef7b45b2c21ae53dd9bb0abf550e
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 17256 bytes
SHA-256: 6bd6b53b9ce0cdeda9ffdceb6fe24d0594c582be3cbd18eebc0406b9acfee7ff

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