Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c82c2d7a4f9be4…

MALICIOUS

PDF

106.2 KB Created: 2021-08-20 18:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4225abb7fe44d662f4333538289594e7 SHA-1: baecb41fd46cafce3bedaccbe38a9f3bd0a08485 SHA-256: f6c82c2d7a4f9be49222c5b02507ed15bcb610955ac8e4c5da81e3cd4c454d36
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, while the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. Although no scripts were directly extracted, the PDF structure and URL patterns indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wadsoda.com/UserFiles/File/81060217691.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf8fb430f---rimulorisuwode.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/64d0e9438d012647a5d59c87024dc821/22957641266.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/57626829722.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b115a4a60---nozobutetoruwejukox.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/aa6fc50aa7901264ef1065f3ac5ce2a8/lavebakojedavomuwex.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jiguxukisobub.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/185da2505dbb12ea02abddedf556caf3/9377079718.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/31369564783.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/11159785351.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1a8b27b8ca36bd7a9ef02ea63f5cc83a/93548575737.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210610133823.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/63462558810.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/vedikogaberaz.pdfIn PDF document text
    • http://vleek.com/uploads/files/giwujewamizaxitarizam.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/fukibikakuxuwoboken.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/69672849460.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0088fe8ad9f812b14ca19339c04796ca/6921499219.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/jobapobegiz.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ca4d8b495efaff03bfbed4c6834368d/10590148641.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c7a83df425112ca171c9d394f703bd87/fovese.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105d6a2e37c6---dinodixamadowewufugit.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9lfqs648kc21p77ptt0u0vbo17/xewofewabepa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c91123c---nijitoku.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f14cf06436b---pixalow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=autocad+civil+3d+2018+manual+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11822 5408 bytes
SHA-256: eb04cac5d35c9e1c1319aebae129950acfdce24f7e5c117ca4706d764851adec
font_01_sfnt_off00012c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C10 11200 bytes
SHA-256: 6f1bbd8fd735f4dac13dce7232d34ca6caa0fe9988c6938bd65a2c4558214831
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 24568 bytes
SHA-256: 92e110908eba0a46f96f082d86ea0e959724162df86a96cedc019c2f4da40b9a
font_03_sfnt_off000182f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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