Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0bf20970b0db47a…

MALICIOUS

PDF

93.8 KB Created: 2021-09-03 18:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: eb7ca5bedb76e8ee1f7e4001e81b8851 SHA-1: 4f3559fe1f1c6e0fab8eae2ebdc2e39959e08415 SHA-256: e0bf20970b0db47a6d77e9b5c927c7d0cb80d0832e3ceaf301abda51d7365b38
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=anthropology+optional+books+pdf PDF link annotation
    • http://paulabenveniste.com/UserFiles/file/dazisita.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ab64dddf75f---2447683758.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/vifosijilegodawipo.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/51558770282.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/69966851441.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tozewogitidesavajiwuludog.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/vivogav.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/87752813543.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/89033959971.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/79784633838.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ngoro4sa10674uqsjk2polv24k/kerapigotomewof.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/fobilulevitafovez.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f1574f4807e8957815bc7f76e413d820/dobefulak.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2eb581f64---dofaraladixukinu.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ebe3bfeb---werenalifasijaruk.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/midaguvovoji.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/91246908402.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/232389365.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160acd99fbce91---91849152226.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb7f9ae692---14556883681.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_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 21564 bytes
SHA-256: 8b2782a1b6596881cbb16664a4c13b326ba998a2ee41a766539d050a36e1b027
font_02_sfnt_off000150b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B3 10972 bytes
SHA-256: e2e6f1834a6f3cc523b03f4b1d7cb2c4d26c75ca90bf59380df6df945fa46666

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