Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1043bfbb5c30de7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4be4c22490a37feb43ff8535beb1116 SHA-1: da76b951b87f4ba5996952eb335cd9e495f29b54 SHA-256: e1043bfbb5c30de7f61a66e14a374e8219796aedaa2a8a10f4a9055e282f0da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6394c839---20453933956.pdf In PDF document text
    • http://tianlanlawyer.com/filespath/files/20210919055352.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/74291046075.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/wugazoneviragagawimarad.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/xavasemirimajajufefebe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07e064c79---fulefepenoj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb9d8fe95---72659217339.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/80214987609.pdfIn PDF document text
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/38340277628.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6qhp090cooos5tvo7slh4rqr45/bozasujuzivotogusiw.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59637627704.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49986748890.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/40555525147.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/zisudevaboferuwobunaniw.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/defirotusotu.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/marazovixejap.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/53f9a36b1fb2cf547b91b878b9b5aa4e/42891022001.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b90d6d899863186ca98c3343e9a506fe/61365957695.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ruwejufezemuv.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_BC938764C0F67C87.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sinusonetipejip.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/jedivuzorukibuzudizawexok.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909011613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=firestick+4k+memory+fullPDF 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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 18588 bytes
SHA-256: 4e177b5fcf1a1ec8224bd87da5cfe694aea3f05563572ef1199fdc2a4b7e4236
font_01_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 10592 bytes
SHA-256: 0d1347182df997e3076ce75f210ee0f0286db15dcd6a92a4f922f3e303ed70e9
font_02_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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