Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdbf608d9c0a694…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b3c75946aed314523d000685ce7f03ec SHA-1: 8b715b437addbb6bbabe804243726c6c27b1b500 SHA-256: 2cdbf608d9c0a6941eb2e84944c23f98e283d3df7f159c432a97593fe1dd7a70
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 numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://oniceh.ru/uplcv?utm_term=ninja+specialty+coffee+maker+manual PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9ef041627---nogezawirirokotogelaxi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084129b9a451---kobakijobuvalamesexeje.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/17023495360.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nivka6d6s2lt2qcgp7v1f1vv84/murutapuvekijiwe.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210823152424.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/18920392695.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/blej1p734j8oc2b32rnaa0rbua/gapizibulewabikijiteni.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/wisusisumedukozimim.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5610d2c9a4194870ecc7de65435c3b1f/zeguguxasomexado.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ce7889590---65198059049.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/bugujikukimajesetarileto.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/sefadobumiriwarado.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/77471362519.pdfIn PDF document text
    • http://coffee33.ru/archive/file/88556282387.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd301b7eb---viremakijep.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071387c529bf---69662058290.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608607771b905---96177668586.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/39027492392.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088f4468f686---1805465516.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/90195525938.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/54621465738.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j0d77ls25k91bm3f8idi0pfpt3/nolawox.pdfIn PDF document text
    • http://islandpointfl.com/userimages/zaruwipafud.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16120a1a1cfec3---pizubekekumesinalu.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/q2h9vk241rvphe0536583b5p84/jaxorivozaxipanazaxapigir.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/48426885689.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 11056 bytes
SHA-256: 7a804f85f704eea226cc0af9a01ef07a629cca16666010bb95b6b3e7caf8383e
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 17756 bytes
SHA-256: 03e29205a690b06a9ea3fef307c0b4e170d19e740510846c9fa69ad9b7a531a0

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