Malicious PDF — malware analysis report

Static analysis result for SHA-256 411c7b82162ee196…

MALICIOUS

PDF

147.5 KB Created: 2021-08-14 18:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95a4ad4cc7f698714cbce23db9b6c923 SHA-1: 8ebbad275d3185948e85e92382f6a98338aa700f SHA-256: 411c7b82162ee196ed7ec73c7729bef2eab15c848b130b95fcd199abf9a80e98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mackyz7automotive.com/js/upload/files/23673158797.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1a5f240104484ac886256a19f855092a/13382540352.pdfIn PDF document text
    • https://o-dance.com/upload/files/gakexumevegatodupe.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/cef337e130467af42b7950c508de6457/21506025852.pdfIn PDF document text
    • https://eurocomm-italia.com/file/97280978085.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a7b45a85a---dixoriwalivamodowigu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ef6e93b3---pajifupogiwowulanimelegez.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/2883895349.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d1c03a7118805b6da68600a176833be8/satanikefir.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///27403958574.pdfIn PDF document text
    • https://ekransamara.ru/files/83567428814.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7c2181404cfb7041f0aa76f04725c7ca/43223890330.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/a2d0a86c5e747d8ed8251c0b2e60a421/robabuze.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/b4722535c9bc4a047e3467254fc4ef2a/wuzelurumutuga.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160949e1699e3c---ladurapukixonagozis.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/lusujawafop.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7da2dd9d8---woxuvemubexupemi.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/basexefofopu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/13a9fed4e43c9f9025abd415519a33a5/42506229954.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161097a598aa62---44868986657.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/29833369260.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747f6eaf134---bulibidukez.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9d796c19---17221569701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=differences+between+literal+and+non+literal+languagePDF 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_off0001dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD07 10976 bytes
SHA-256: ee241acac8d4cb8de6d3c42186332b0901edb907fe8d1d882ba9defcfda83109
font_01_sfnt_off0001f68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F68D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20E9F 19896 bytes
SHA-256: 625c0ccb8ee7a00e3c0a889e33980bcbd6d4c944414947abcb15dd7be2e2d3cb

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