Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1b2fe6959eb9ca…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 01:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3e64896302f51d0d72319937527fee8 SHA-1: f8aa7402cce9a8af9820328e4a8a3220fcc2d7eb SHA-256: df1b2fe6959eb9ca19e3fc2830860b255434e596a856990cb68b76e68727bf9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://queure.ru/uplcv?utm_term=gta+5+download+for+android+free+full+version+without+human+verification PDF link annotation
    • https://greenboo.vn/uploads/files/fedonajuradopelemidubofo.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/71459415979.pdfIn PDF document text
    • http://agama-rc.com/upload/files/39273093863.pdfIn PDF document text
    • http://tokado.ua/media/file/43438931556.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/58416711106.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/lurokenupukunovudigigu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/89707990180.pdfIn PDF document text
    • https://msiutilities.net/documents/vuruzutujumujoraxoral.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/50505066421.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/214621427.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/4168744929.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f006b02e5---38272672768.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/gazerut.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/36675973462.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/mupesuvavitavizelirutuded.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091005043696.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/wefezerageba.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/33037754954.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/15a4adcaca6dbeb7727d806b456a956f/resagegowavewigasovilej.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161422691bc7da---21728235555.pdfIn PDF document text
    • http://kd-council.com/upfile/files/20066967067.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/lipitoji.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/betoxowonu.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/60487411878.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/30535332584.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_off0000b152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB152 11164 bytes
SHA-256: 0b4d2a2778a527873f188838a9a9597568faab50f07512b992aa99b4b584a73d
font_01_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 15888 bytes
SHA-256: 0bfe2fed057fc8bd6e47ba4a33bc1fa5713fea4642977e0d07a5847fde9abb4b
font_02_sfnt_off0000f43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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