Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc20a4cf4deabfb6…

MALICIOUS

PDF

95.0 KB Created: 2021-07-07 05:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8c90dcf4a8639d36c867cfbbf464b830 SHA-1: 3455466e4459f991f6bc1662a6bef3ff3d5eda13 SHA-256: bc20a4cf4deabfb670d87ce163a6c146c268a56b547682f10b9f0e5409d39fff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised WordPress upload directories. The presence of a 'Download Now' lure further supports a phishing or social engineering attack pattern. No scripts were extracted, but the overall structure and URL findings point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • 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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d720db71abc---burale.pdf In PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc872565f2---83780442675.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160acc8eb42ba4---82468423861.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b84ddcc9---62179434765.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcfc921802---vukexufutida.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fa44f50f---vojonipokotiziwon.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/56akd36p1ujcir108u19gq48e7/lapirifewafefa.pdfIn PDF document text
    • http://metallpress.ru/files/xusobosoziniwujanavidob.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad88c701e27---49694525349.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mhtomj477rfj02hu45hqegi9l0/nugetidovaro.pdfIn PDF document text
    • http://deltools.com/userfiles/file/buxakurulu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7843a8fc34b5e6851bfd2c7d7b8e2b94/lozosufomusubezogizuvin.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085e31ebd267---72272829251.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/99279199528.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d85f2bce---68740500223.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/36814730387.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/d8b07d94be8af21e693c53e81c6cd7f0/45388847192.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210625_4938F0C432B4DEE7.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/jimekafinawisixomomefeni.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/24038299387.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/fuvawamusodetabogodom.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/22811743372.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/jewevamaw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/mukasojovegelatu.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/jagemogafivifat.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/butesaxipifikuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=10th+sura+maths+guide+downloadPDF 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_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 10956 bytes
SHA-256: e6adefadbcf1ff74053f7afc8822140b81ba657996e0595b809b676c23c68d29
font_01_sfnt_off000128b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 17484 bytes
SHA-256: b3b587bf3d56e8eab5b4bc353d8b5fd9894a4ed535bacf8596e217672a73c6ad

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