Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8344711fd58e0c…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 10:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cbbd5df2497d76237e6312db2b7586f SHA-1: f593ce9e23cb2757350268141218b07ec355496e SHA-256: ab8344711fd58e0cfb10abce3fa0322be67419263d12a8af60282350af5e98bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic firings indicate that these links are hosted on disposable or compromised CMS upload storage, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d15aedbef---dufuteme.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/siremonanadipidovamulawon.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/besurowebuwemuxo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210611122047.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/52613420870.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/60tu6aqjqikmet0628qlcufl7r/goxavokileb.pdfIn PDF document text
    • http://beauty214.com/uploads//files/202108090502264227.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/81991313296.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/12244366364.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/bewitagunugiduxewo.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/64367594515.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7b195f7fe238855ca821cbc122e835a5/tafiz.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/jifezaxasozi.pdfIn PDF document text
    • https://petkasem2hospital.com/images/upload/userfiles/files/fumubujumelanozebeduruv.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/3028935243.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/94031770611.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/60251930206.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/redibe.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/narezi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/09f81ed4cc3ac235c3636ad52a20ad69/pifupux.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lizaj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841c24dab30---10831938856.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f834b3ee49---50480003974.pdfIn PDF document text
    • http://aven.su/userfiles/file/86015248973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=all+trx+exercises+pdfPDF 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_off0000d676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 17948 bytes
SHA-256: 27adea3211fa4a35a8a936f070baf91e1addcbed9b72b120f0583e36ed3f9854
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 10312 bytes
SHA-256: 273fb7bc1f835640ec5181a5a27c387f19d8661fb677c252978bf1195fbd379a

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