Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b593cd748cca12…

MALICIOUS

PDF

88.7 KB Created: 2021-07-16 14:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7ebe5176a3ae667968e03d790af280c SHA-1: b7bc77882ca5f01db3c6569afea548218b353e4b SHA-256: e7b593cd748cca122d339e629ffaf519fc3a9dc7e37249c7914b0a6b081a2397
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nomylo.ru/uplcv?utm_term=social+companion+meaning PDF link annotation
    • https://isosklo.cz./uploads/99757180680.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a3caec102d2a2cedbbcccad95f413c67/vexijisinemuzawo.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16235805353341.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/20844085015.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb0939a5d8---13198443478.pdfIn PDF document text
    • http://dentherapia.hu/files/file/21678358986.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb03caa2e---pativot.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e7b256e---zimipenovefobasevivero.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/12518568668.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab57c98eb86---94656826086.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29c2930b5---tupagomope.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210608_A2348D739D251355.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d10qamdmi29e413mairk4bo4g/98981469668.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9174d8b18---zovofosevemibanamisumare.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/budurufefetowexamo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b8d1675abd960385fe123261c0be724d/norunokusapabewebuxe.pdfIn PDF document text
    • http://asustainable.com/global/file/dafukamilawasesat.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe95f67b36---25388234529.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eb3c8c981---46639510598.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a296bb721---gaxalexowefegikiki.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160716d3af1bb5---91352244209.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/xojofim.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/60565698982.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801a934f455---sapipafebumezone.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/13l2i3jc3hsp9usqlca82up8si/reriba.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/7e73ce5a13ee59a34c27ddfaac7c92f2/kevuledimorolajojevazilu.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_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10424 bytes
SHA-256: a7d321878fb0bda044e47c2885b270967e958017b2dd7b0b3f9cbdf5fb294fb9
font_02_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 18176 bytes
SHA-256: d88e6ed5786f43baecc9427fd7df2f9c648c6c9f772e8562613f8f36eb8a16b2