Malicious PDF — malware analysis report

Static analysis result for SHA-256 6461983cee9cce63…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 23:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd104f339fcbc0a9ca1166fcf2cc29c0 SHA-1: 3851b8051d778c61908ea1d46ef7a098444d7717 SHA-256: 6461983cee9cce63ad8544e6017a4acdd03d924402ff1dab8e0b27d7b2722159
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 that point to compromised WordPress sites and other domains. These links likely lead to phishing pages or serve as a distribution point for further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users through search engines.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ovarian+cyst+pdf PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0b982881d43edd0a736e60adee6de144/95087335196.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6004315736bcbbdda90325fb019214fa/weroxotawedibej.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/acb8e142a247a5f4aea89a22fcd73d30/mejopuragotafigomul.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bc437340912eb13a531b187a60aab420/xujinebe.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/seximos.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/44984231060.pdfIn PDF document text
    • http://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/83555400454.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090201045516.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///sisaburejujagumudiweba.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gigubix.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/vawedotelakejomapalarilez.pdfIn PDF document text
    • https://medius.sk/userfiles/file/zafefomaturudawugunejefi.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210612_301805370DD1DA9A.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xofomegi.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/danav.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/ligesigerezux.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/71394305540.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160934f786bb78---xojopoguwijilokuvuxugifa.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/ketobemubupujevemexi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160966f2cc1812---bewatunagekajigofe.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc77acbed4---49731410497.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/paxegemimazupamovume.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8987d0211a---pafawidakujikanirumorused.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 17120 bytes
SHA-256: 892f33a0275d47242b1856998c7e8ac4b376997d81260bd1485fc91a953802a0
font_01_sfnt_off00010511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D28 10520 bytes
SHA-256: 6d4395f8f2633d0f28e248c2dd87ce807708a481b2a060f9ee0f20e76937b91c

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