Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fbb07c4795c282…

MALICIOUS

PDF

88.0 KB Created: 2021-07-05 10:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b7b621f4923ba5db5c5d92e992c320e3 SHA-1: 8f9b94459e27be0f793ec8e2a31bc66d4bc15d9c SHA-256: 79fbb07c4795c28248e4858d02767b932486afbb8c4bdcc76cc5df1cc05c5440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised 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. The sample's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://project-lovcen.me/userfiles/file/zedobifosotel.pdf In PDF document text
    • https://tonwen.org/userfiles/file/17422561744.pdfIn PDF document text
    • https://la-klamm.org/Files/files/wunevalevifajopo.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/80453966368.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/edc24a0068f094200c8a37c00763fb54/rupiwakajuvezaguzeguxexe.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/16552ab221afd3539ccfc06a35394254/40581240738.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/62899478330.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3067d3a8eb---40277694887.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5eead376---xotenogikizaf.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/surugunalabaxaxapowubibo.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b92999b545048c69b7d99221a657d1c4/42467264094.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0740d40163---75442484281.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/82037744688.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8842e68424---dilegekim.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070be3285e61---5955040133.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3b98a6e5a77e48c49e3e5ff6f897e521/tuvuna.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/nalupebufaxijuwi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a87c51b062c---tosariguralijoviwanegir.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/lelufapono.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4bbf23fb30962d7e9796da4a1d81c024/xekavezakoretenokikopixa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754c03e6350---xisemijufo.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/wetorabakiluki.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xomekodunikepat.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/43514039071.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5360d34dfa---tesas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=downton+abbey+full+movie+onlinePDF 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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17708 bytes
SHA-256: 908c1dda5d5f2580fbc70578a5002dc81b71d308d88ee2e254e5fd71336475f7
font_01_sfnt_off0001225d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 10612 bytes
SHA-256: 5ec8b80a79932522e183622dc9657d656c07394535ce1f8729494c67d595ca71
font_02_sfnt_off00013abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1