Malicious PDF — malware analysis report

Static analysis result for SHA-256 db178c9179e7d739…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 22:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 273aee63e190524b84315013b9469da0 SHA-1: 087d0904652e394390642d2dcff14906f818ab7c SHA-256: db178c9179e7d7390a6f48d18fb5b1cdec3eafe45794046f959105e0cee6c2d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to lure users to malicious sites. While no scripts were extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8900

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0679df110---10365113786.pdf In PDF document text
    • https://victorybear-info.com/userfiles/files/lenosafugubi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/miniximogapuwujokotumoz.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jevagedopawar.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/88956350f469ce3ed0707f6efc502227/xazaji.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8ds0r28mhqdlr1v71l1rb1uhv4/jorojol.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/7058830543.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/23105333566.pdfIn PDF document text
    • http://keacg.com/upload/files/54195334200.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/pipur.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/59674578377.pdfIn PDF document text
    • http://goref.ru/files/file/nimopobidutuladutosod.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e8932fec73b878d4bbd019f1131343f6/9855686500.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lunotifijok.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/kawefojozetugagajinilem.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/nenivegatoto.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/20735290497.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb705c28c3---47688746795.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b571c07795---xedujep.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/raxegatamekavit.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/sewifonus.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/7881674836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=modelo+atomico+de+thomson+pdfPDF link annotation
    • 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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 10776 bytes
SHA-256: 05d30e33a10d40fe47a83abfad8832a660463caf6e3e345db8683a76848d48d8
font_01_sfnt_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 20588 bytes
SHA-256: bc71727aa463791793cb17a94c947cf974dea3e69e438ff7e14a01d903aa77a6
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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