Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5734ab842e884ec…

MALICIOUS

PDF

75.0 KB Created: 2021-08-20 06:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c31fd5031c3dcfc794e0ab4f0693d9ec SHA-1: 4a90cb9e8349c205f6584deeadd1a43f7824e258 SHA-256: b5734ab842e884ec9d4bc467b3310eb3b7354c90ed7112e880951cd51ccbd374
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=complex+noun+phrases+containing+gerunds+exercises+pdf PDF link annotation
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/df002f1c4ea359a156b46594b5ea4c95/15772151772.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/28000297098.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/wurifutapezemiforave.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f78c30d9f2---68897086814.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/jewewaza.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6d875e7f---76711856907.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e13eb95c671---fasejesulutifem.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba94a67d49a---91294675345.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/52012585684.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc9de3bfe---vuxipemulunud.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/motemesutifasepigi.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/pisetupotetereseso.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4023438f---66926533472.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/290926e78e068175af55534acb26a894/84586226708.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/87190444484.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46985d60cc---fawetizepukapakawir.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e9252393d---faxusejubag.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/samenokenixemedawuzok.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/1714099786.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/26808654716.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083528dbb7bc---dunupifivupujoriwudu.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/3dda773e1f582b786a3f500285c458db/revivigipatudavodep.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/65227115357.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 11300 bytes
SHA-256: e457b93a4e496043b4a98f1c9d40d73aeeb4434cd2667463ba85f0cf0c5ea175
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 16732 bytes
SHA-256: 13f0634432c82c79557108fbf8fbb325c8ea7cadf7ab147edbf56c01af18ac7f

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