Malicious PDF — malware analysis report

Static analysis result for SHA-256 848059817d696153…

MALICIOUS

PDF

107.6 KB Created: 2021-06-28 10:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0f70356b1e9bb5bd787dd207643db4ae SHA-1: 868e7832364ff1f7740b67e1c3641d690c728c0c SHA-256: 848059817d696153e8881c299d149d41f2999efe4b4b81f0c107943f061e06a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=mbr+wastewater+treatment+pdf PDF link annotation
    • https://africanresearchcenter.com/userfiles/file/xedezutuvapatetar.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2u36i7gb33dejsab6u3ern0v17/20277437137.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210624095353.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fkqonu8ga7862pn007h0kti2uh/bonukafarotisuvo.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/rusukorezatofonod.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/73063942497.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bbceuh4oqdpalqu57ur2cs0hh5/75126188647.pdfIn PDF document text
    • https://luminex.pl/upload/file/69859343122.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/guzaradidexiwedakobeg.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/72f2427b5a47d5cfed7bbf140db57098/tukibifizimedunoxejexagos.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ddmb1a1jjdi51367d4frcikd6r/61709208998.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/24024442403.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16073d1e327433---3513314508.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adca2b8e0af---tokawojevamadu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/28805018809.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/fogedowewurovagupuke.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827d77772a2---40455450387.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b3abbeb9eb399122bbf5a675a0af05df/67646146283.pdfIn PDF document text
    • https://plasy.com/uploads/file/juzezuviwudu.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/winokitomid.pdfIn PDF document text
    • http://tipiland.net/upload/file/37546468230.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/15400660573.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81b1744c9c---37409634283.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e5cca8060---monikoraru.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/sakewube.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_off000141b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000159cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CD 10620 bytes
SHA-256: a62e4310ae6dbb82c93ab1a03c86fd775ad1b08fd460facc54ff7037fa568f73
font_02_sfnt_off000171f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 17888 bytes
SHA-256: c886ef2de360c998fc3f2bf7c4bc5962d6598d0447f1b269ed9bdf924ae3ee80