Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef47f9b7475b3c9e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 13:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 97ba42a1a6222111aa60581ff6cce8e1 SHA-1: 3b714e8fe654c255137fa044d039f96f38cde6ad SHA-256: ef47f9b7475b3c9ea4e3a78a74fd682f9e132ff09cc0667ca34bf0f3d258a1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=wwe+2k+apk+mod+download PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613970224193d---xofesupezilemunikoxam.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417c440ea47---15276326187.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf1363d2c---13415019750.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/84832557596.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/56586302599.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/81668616318.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nifipezakitesarap.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/pazamubal.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911044330.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131269952bac---venizoponeguforavupumu.pdfIn PDF document text
    • https://betsin.org/userfiles/files/saxubo.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/temibetutudesegovu.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/suponaripeseforonofavupom.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/wusubelekoziwelibatodudi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/5534a278bf8e9ab4cc6bfe01fec764d2/xilowusujimo.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/79479535277.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/rakebejunoxada.pdfIn PDF document text
    • http://bankerz.in/qpic/files/sabiled.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/mafowemukurokofozod.pdfIn PDF document text
    • https://latework.cz/soubory/vuvedepaxij.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/63825353232.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/nimijodanirixaxudeli.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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 19056 bytes
SHA-256: 0856fbe01c12e88ce99a4ddebae08d756d23340a70be1ed59eeb05c2f4236b16
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 10388 bytes
SHA-256: 5480ed2de667703a73400e3c942ee75d9f011dbfe1dee8b9c528cfcc9a97444b