Malicious PDF — malware analysis report

Static analysis result for SHA-256 5066ab5e60565206…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 13:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fb0560384b0450a9d36945306d0457ac SHA-1: f0ab5bb9b199fc7160119b5f163b5d691628cb41 SHA-256: 5066ab5e60565206934e2fe985c9e8784eb23810444456090af63ff10ccced71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple external URLs, some hosted on potentially compromised WordPress sites, suggests an attempt to obscure the final destination and evade detection. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/19dadmi7nhodteb4fuv4g81lg2/29970316075.pdf In PDF document text
    • http://hyeminshop.com/DATA/files/pogokosojinekorefekakak.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/sajigesifegun.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c449b6c188---85007848855.pdfIn PDF document text
    • http://hkacca.com/userfiles/kubatedekamiboner.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a67cbbb97e772df5ef42f4d821a6790e/vijisezuwaseverituteniz.pdfIn PDF document text
    • http://csp.hu/editor_up/88417445912.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109232249188797.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/kubegiwumaxowitovok.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/kesuvasodelosem.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/64120697351.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/80eqviejlpg7ce8e7kpcek2931/31884869786.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090800330873499.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/87688874337.pdfIn PDF document text
    • https://aneri12.eu/res/file/xozib.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/86629943178.pdfIn PDF document text
    • https://bagstyle.uz/images/file/49027346487.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/pedoviwit.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/85007236359.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/77500889832.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210913123239.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/rabazekefujoxadomejavuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=android+animation+scale+settingsPDF 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_off0000ae71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 10696 bytes
SHA-256: 9c98a388210219e30785bdb08afb3f0cac11932472e88e2f298ea08de671b922
font_01_sfnt_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 16748 bytes
SHA-256: f1f4fd85c2f30266e9224b8ab4c3292da9b24a603e8aabec57769051698a6acf

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