Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d36420096cc04f4…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 06:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 296d93ff07ec0d1cf9d0c7885825c716 SHA-1: db7c05763ce4d972ff5e5117d9582cd7be50d31e SHA-256: 9d36420096cc04f43bf41f5ea01c6bc397a6cec009c93f3a84332155f81f6707
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The PDF also functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites, increasing the likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://thallo-food.hu/uploads/ckfinder/userfiles/files/jizadonawejalexazuxo.pdf In PDF document text
    • http://dtmaso.com/public_html/Imagens/file/felidadi.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/2258296451.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/40783210294.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/jakosexofulimijelotenafag.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105cd0ea3de7---60141749213.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/24836965773.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/90926402cbc32bdc555172c5d82581fe/31731801982.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/vedomepafiboxiratililebi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/65098533651.pdfIn PDF document text
    • http://scro.ru/pic/file/27720226082.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dikepobonogubewawomim.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/26324717627.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1006889d6eb9ceb165bb14eacabc6019/darowijutube.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/63454735288.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076960694efa---vepudir.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/p5gafukh3qmb24k177vre23r5b/gufajidi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/57399211730.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a183d2404c7---pumebowasewewotigiref.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/xemexitukuwuzujef.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/zeburonomuligomunif.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d35a956---gitarefapemamoxajovi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292ed523889---tivilegiwixaderafupuxip.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kotatefagopinudumevudofak.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/tofufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=los+nibelungos+libro+pdfPDF link annotation
    • 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_off0000bc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4B 10612 bytes
SHA-256: bc4ff870e58ac682ddcde4a9f9c7a9698d11c647b6c5bc1a320a1ea3f19600c5
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 17824 bytes
SHA-256: ce35947db21afa07a6578faac3fcf60c92cb7f5a52333c2c9adb215109cae9fc
font_02_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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