Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b377d878f3e0305…

MALICIOUS

PDF

102.9 KB Created: 2021-07-27 18:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ae979b0e0f756c0f5da5c0bb4fb535e SHA-1: 7222aa14eea9a879686572e1da1032f026210440 SHA-256: 8b377d878f3e0305956bf268150e9d249bcd7a42a074a880c689461ff1a5bc2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings suggest the PDF is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/g54h3pmbhjhbojgmrf2jarlglc/favodil.pdf In PDF document text
    • http://citywideok.com/clients/75789/File/327906277.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965f5f622e1---bibepegodejoteno.pdfIn PDF document text
    • http://dentherapia.hu/files/file/tekukigozode.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/10832090633.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/413e844595dd2af74c07bc4d78a68b08/43442805622.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/23864829169.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/dabozuza.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bad02862312b63692edb8d6352e2a5f5/zofuxuwik.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a955de579---wigudusal.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/71312158857.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/mupege.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608872e22a383---nofadunogexubu.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f36dc05244---nomilopuduzil.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1f3d15fc8---zetokeredasavosuzenaroz.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/18852712117.pdfIn PDF document text
    • http://fedoro.ru/upload/file/xinanurinu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/56306599458.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/boxusasaredad.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/15384390499.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9eaa52e5b---70992840574.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/23399323830.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/a5a6996c9115fdc5e9af3e73f122ecce/35308164410.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16074578cc9beb---83234372247.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/263f349c052314f359b3844fa09e56e4/tunonixa.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/2188647870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+does+agglutination+indicatePDF 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_off000128f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001410c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410C 10644 bytes
SHA-256: 6b3f0abe13d857316c1fcdeab9d4ca4fb01618de7954d52d68c3dd32041abc4a
font_02_sfnt_off00015927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15927 18896 bytes
SHA-256: 4e63d52a8a4e2d700dfd83d04c03b809ff6649a209dbac1b3fe9267518391d7b

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