Malicious PDF — malware analysis report

Static analysis result for SHA-256 7988b70afb8547a8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 10:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 56b783c6eb00ee89d1bc9d5739b50918 SHA-1: 03a0504416b8d3265ac2037f6e765a1b896dc403 SHA-256: 7988b70afb8547a8cdcd237016e74d352e67029a938f727bfc3eb3da3eb42435
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, with several heuristics indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://eatorhours.org/e-bussiness/fckimages/file/lipatumevopukofirez.pdf In PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/97844954826.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210814_023509.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/zupatotutaxololit.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/55597643464.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512ea87899---18515128613.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d094f4c4a35---60386407287.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/raroxosuro.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/54225964063.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/gagirexozetebuvuxipakuwuw.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/utnn242os8deb8p1b57h5ps3ps/virubesepu.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/7772913344.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/susovunituranijedutejig.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc59b613674---9010453635.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/kalonegulelejosi.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/acfd5b840330e5927113496f14387871/19851827755.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097c20f1a3e2---kapepanotipom.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210513024422_1423375405.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/dawotos.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b856f1ca99---kigizezani.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mimogapavepazufi.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/suruvekabomaduv.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/tejife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cosmac+elf+manualPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/32676620525.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_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 17664 bytes
SHA-256: 3a8e60dda279ad9301431915c8bc7a7874e3894adee307fb5caaa05896eecaba
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10336 bytes
SHA-256: 32d39d48abac6a8cf156bedb77f52f63b56770133e832e50bd26fe2fcce1392b

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