Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966c8fc9e5efc68…

MALICIOUS

PDF

83.0 KB Created: 2021-08-05 14:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9aac5b459446aae9d26338f39c7f48f SHA-1: 25801c57591a844d60decfddf59ac12ccfb02912 SHA-256: 8966c8fc9e5efc68a6a27773208b869170bbaea6332aa29534377b79a901cea6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/jufuzewilukalikuwem.pdf In PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/97375650526.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088216ad13d6---93946410303.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/vibotasalonara.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c2298bc4402b014591505421f7c4495a/jetefibomut.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/86440876562.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5699eb35e---93636437627.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/laninebo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ec1ddc32---75266930445.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021070913434173499.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/63464303619.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/39588519053.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e26b6962dd---47334327446.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42ba55f8750d836cadd7bb52e16babce/mivilikugenef.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/pelomozo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9fd1603ea0f03e6583868e2a968c8688/bizovusisumumuwomuwutogul.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/menowolapinigagodipofiv.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/fenidewumonarij.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/99192599625.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/14992599578.pdfIn PDF document text
    • https://cape-electronics.com/media/file/92462642916.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/29690658123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=12th+chemistry+practical+book+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_off0000db00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 11200 bytes
SHA-256: 9ff655dfee18ed3667ee37e8d4a9b4b7785a355b5aff3a8ae1d79068bce95b2f
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 17948 bytes
SHA-256: b9c4130c39e516946614ec6e6b3f21892dfa7724d3bc3d0ec3548d79c4d1539a
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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