Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb5fe98341bd8912…

MALICIOUS

PDF

104.8 KB Created: 2021-08-16 08:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 40e746f8238cb23ca3471030b45e8dbd SHA-1: 17dca79dd7edd79929d822800552f76397177ce7 SHA-256: bb5fe98341bd89127650484b87df06c4347819212326cc10098062f48f464974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=heat+by+mike+lupica+audiobook+free PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/petopalofizeseranukupo.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/kajese.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9d8c63e99c11ce33844c39c0ebe8fdc1/35452652419.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0619cf89---dasafiguzelibareluleguv.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c8ed732657c5ae8c5b679f07a6923afd/bigebopu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/xexabamore.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/meposujivek.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/rajokinuduxomujixofi.pdfIn PDF document text
    • https://ekransamara.ru/files/69099153756.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/zogofunixinediro.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/42606017861.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/peroge.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/103011068260faeaf67b43e.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d897c1c5---8357249238.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/rosudopulizonivu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607270f7da984---lovulox.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611917a4ed589---dukawikizijosakunis.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/39816749334.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798ed6d8f7b---ronul.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/03945a77edfe28e6367f57a434cca7fc/40396744770.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/lorasatol.pdfIn PDF document text
    • https://isleo.com/i_photos/file/tolawisagovepogapazad.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd5560d63cf---mululunosagawilerosasuva.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc9264be2---13044069672.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_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 10944 bytes
SHA-256: b48c961cc60ce4f9c4463ecf1c4e696d0f7085ce48828eb3bf15e6a07beb5719
font_01_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16657 17644 bytes
SHA-256: 80bc6842f44edf6b164bf81be4b680d3fe3054ba0e5ae3dce505fbb66da3eed0