Malicious PDF — malware analysis report

Static analysis result for SHA-256 196c2421a48adcba…

MALICIOUS

PDF

74.0 KB Created: 2021-10-03 22:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: efdea0b2f090282deae0f906e357d0b6 SHA-1: 7660b6b0eb262b3d489fdf69f741ce4507e3626e SHA-256: 196c2421a48adcba41cfd3ba6da8322d359db1c5ac763b63c8e7785150c28351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://aranykoronakft.hu/userfiles/file/30323796246.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/redonikanojoraza.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/nopidezezevowasegidu.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/36714242697.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/32135494764.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133653361c84---16165999808.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090419030411.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/79696628024.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/wofewupasokedinumeve.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec9f7413e3---90190528539.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/44904469699.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/jesaxobumurezajupod.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138101921367---40867322610.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/89977298082.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/69537355583.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/30352302885.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091319174217.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/52885468378.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/76036910759.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/89403341092.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/7613515069.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ecrbgtt5b66es3s01kbe1b5ds4/54341971181.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/95694582837.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/masosuwunala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=boone+county+court+docketPDF 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_off0000b84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84B 10252 bytes
SHA-256: ecc1630f3a02b6a656554e70fe4e453a517dcbbdfded645c94f6431db76989aa
font_01_sfnt_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 19344 bytes
SHA-256: ba75c02c18f4007a22703ad673e3ffd01af5a5c4a670f26c7300ac9622c61adc
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1