Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca544c2ebf93a4f6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 00:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ad6c78b9961d92c9bf72479089be9f0 SHA-1: 3c05f3f2b73d3e85714c81b6a7e325b8fb045aae SHA-256: ca544c2ebf93a4f650623e360c0c40e40063e1bac69d477d6a442916ba2b70a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to host or link to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/dovorugonow.pdf In PDF document text
    • http://taaltoetsvo.nl/userfiles/file/bizofesamijodimawiriguv.pdfIn PDF document text
    • http://poultech.net/d/files/jiwirabirabulazemu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pekolagapevuxum.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ql2qevilanonvt5c71op5r7gcn/87369717364.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/31875079275.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/17465882785.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/35719171425.pdfIn PDF document text
    • http://soc-in.com/data/media/files/6144557023.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/90770080852.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/vetadijoxetabaxovub.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905100235.pdfIn PDF document text
    • https://strechybenesov.cz/content/62298987655.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/42408333231.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/53700616847.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/99076929291.pdfIn PDF document text
    • https://best-label.com/upload/files/12188672517.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9f14d7e1c35a31050d2efbe0aa7d8846/sakejojukojudupajisamox.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbdbe040bc---7797575004.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/ravepivifafuwatogotar.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/lodiw.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5006695f1---vikejakigizedavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+hide+your+last+seen+on+whatsapp+androidPDF 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_off0000b36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 10780 bytes
SHA-256: 8ec080ef5772119442c9a760bab3e2c11b9f9e634b41f42441ce8abfa52ecd8c
font_02_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 17692 bytes
SHA-256: 1ba6850d7b5e562e4b0ea9206d083b0555eec55a1bc5619ba736cb7aabf97b7d

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