Malicious PDF — malware analysis report

Static analysis result for SHA-256 11163baf3347aaf0…

MALICIOUS

PDF

90.7 KB Created: 2021-08-04 06:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7bd527c9873a34d104c08e9bd5644d6b SHA-1: f0bc06b82b574eb166eb5d98139e88b639da3b19 SHA-256: 11163baf3347aaf0ad9ca2e5b221c0728fbd90bf59f70524efaa998699c32413
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to download and execute further malicious content. The heuristic firings indicate it is part of a link farm and uses invoice/payment lures, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://irlanc.ru/uplcv?utm_term=cuando+se+paga+tenencia+en+el+estado+de+mexico+2020 PDF link annotation
    • http://ohappy.org/userData/board/file/47293809892.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/51204867579.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e1e03e29e---vobavikobepivogebiwego.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9f36efa7be9779fa57a3877cbb50c7b5/sekozigirejana.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad6a1f23b---fugolubapijidoweferilifi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/55abde645b89158d976d42e6db44e555/31588133629.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26f1267b1---poluxuxafusu.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/14331410595.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/65e74718c5a9ad63dd5fef2c329d1e7a/juzixajisatutemute.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c69493e88ab---2773352165.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8e3aac941e9f190ddfaec101f9349cd8/vasusefavojudasokebudaso.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/jekinugerunokasijal.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/6762552395.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/pafisokiwiduwirirozome.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bf4e50f10c35a5169a0ff7ca47d11e36/juluwugofifitidefun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d09c02b7---guduzatotojipadumagomarol.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/nesajot.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006327adbab---gudobizatebexem.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe004573d3a---kejuwaf.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9ad9d17e---gonofaridor.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3467d4be---lewuxowugodogonew.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210619040200.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/39426570698.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dajudopovedowokenobod.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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 19196 bytes
SHA-256: 071157b81dcc1111742a784c36a076c92cee178952e8692e9a990cc831828aaa
font_01_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 11232 bytes
SHA-256: 93b88d7e039aa1dd835b1f63d71d50b2565703b3323e70991612ca7246ddb214
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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