Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1352f650b14eb2…

MALICIOUS

PDF

89.1 KB Created: 2021-09-02 02:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40a2cbfead2dd941d3ef9369225584b4 SHA-1: 63402e712ad4b79872752a3d97c407c6200251bd SHA-256: 3b1352f650b14eb229898d075c96b5408fb1cd7887bf4484612ff2fb998aaabf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites.

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://huntic.ru/uplcv?utm_term=jimmy+johnson+hall+of+fame PDF link annotation
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff7e7a941---banuxeke.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c2be7f79---77369848503.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/22775844048.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/zegof.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/janobadidatumen.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/16356140774.pdfIn PDF document text
    • http://krupongs.com//images/file/94587058014.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/46792825062.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/xisififolovujejajev.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/8jd1mktqg0qhsi8lk6pa95ddm3/63067401352.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210602173538.pdfIn PDF document text
    • https://ka-base.no/images_students/files/23946677052.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2263456db---88422370205.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeba2e939d---nafipekogizexowajitezozir.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/susexoditibaxetesewedagi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/51923409397.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/67811764353.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/16260375794.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609feec0cc3f0---2944120071.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nhcpbplvdiukd1ukjjhtgqndh2/zerigo.pdfIn PDF document text
    • http://jarosi.hu/files/file/60508111423.pdfIn PDF document text
    • https://rinducm1.com/contents//files/situnodirigu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1r3dra049atuukvso3nloopvjk/57712413768.pdfIn PDF document text
    • 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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10516 bytes
SHA-256: 16cc0309c218353c843df348c77dc81f71b7b09508f8208a8503bdeaab65595c
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 18300 bytes
SHA-256: aced5ca4084698f3eae2a554e5cf4d0377582ca31e8831e12f1df028b38aea3a
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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