Malicious PDF — malware analysis report

Static analysis result for SHA-256 73964b64f9c7b345…

MALICIOUS

PDF

101.1 KB Created: 2021-07-20 09:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b90f210c0b417b5b15e952320398c6c9 SHA-1: 8b3a0821b8b6b4f78b88cc4b9024943805ae2ea2 SHA-256: 73964b64f9c7b3454b2cf9709d0da34eafd1c1280bbe393ac4a1135833a34bfb
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1f360c87---dilovaxevopabosefawiwupob.pdf In PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/xexiwelazuvaj.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/32236f8ce3dc7df36ab15c4a0aadbf9e/daredafukebitokom.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe83ccf5ba---surotaz.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/pemisumofeporopapi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c685381c0f---88010816028.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/ponitimi.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/98140566089.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/57593210711.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/37da6b8ee0116dab52dfcb88e409dff2/ridukevozorixenotalif.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/20989709112.pdfIn PDF document text
    • http://specimport.by/files/files/64397487176.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zuvafezalam.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zunelibokexu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/91212327692.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/90038389516.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4e2fdc6e1---rirufupulibo.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/xaruvo.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gepido.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/pexajosuzovuxepuxez.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1d9920a8d3e109a8c194355d853fe99f/xemoz.pdfIn PDF document text
    • https://biocoils.com/img/file/suwem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fade+into+you+song+meaningPDF 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_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDD 18140 bytes
SHA-256: 1413100596106c6615ebedd4194076b5253fa1439e6d820af8505b4302d73d48
font_02_sfnt_off00016f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F5E 10636 bytes
SHA-256: b85d27c63ad73b62396759f76acff12b89dee1a3c43aba36852a41e7113ea579

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