Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e0aac03decbb99…

MALICIOUS

PDF

76.8 KB Created: 2021-06-29 21:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a8430853f616d3bfc13dcac021dd20a0 SHA-1: d110d9ef7ca949ba92d6e30e7c9313495e474ad2 SHA-256: 59e0aac03decbb99e545bfd4acf7d71c1b91ca2b7751500c39924356e8aceb63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites. This suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/avbprull7mgkrgkibgmc3a3mub/83671068664.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/tefebelet.pdfIn PDF document text
    • http://firegallery.ru/img/upload/41618090144.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b86d1a09bcd85abefd1c6f63cdd946be/zopulibixiz.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/21313565574.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/94d5b374fab9f38305e8a92d2df513d4/gerexa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160800d7cf1b1f---42877701681.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/61056138622.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa054984823---87676542461.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/zodabawamev.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/98ac80079be02163010ad5dfdfd8b0d2/xovulidaxabizetuke.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/nevefekapagon.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/vogibigesulavejarorez.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/51400268236.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/h9cko5fs8pipjuiku0a39pagc1/45318717575.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160880170e178d---1267198491.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4470d5c496---vaniguwijubatibewovufage.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/towesebejulame.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796270ddfa---40587831613.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1aa5aa715---zitoperala.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/54504736887.pdfIn PDF document text
    • http://araonline.hu/uploads/file/nexadorelelaz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/863ei77bvtffthpi8ke02e4be5/fukonakejimuvawadila.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/86245965170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dna+feat+suzanne+vegaPDF 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_off0000c97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97E 17816 bytes
SHA-256: c7b1e4f939fe9b677e59f2c9a65eb7dfe57bc8c1228edc85d73870d9837f5573
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 10256 bytes
SHA-256: 7c69d0a2e94e3c9d029eac3b50c66a1c3fa5ac53dc90da8257c827c9aaa4ee64
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1