Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdda00bb7f79a83…

MALICIOUS

PDF

83.8 KB Created: 2021-09-13 15:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d87adcc30446438bdeffec8da86dbac SHA-1: 58e0f70d3493589717f624f4f86ae32299a1cc5e SHA-256: bfdda00bb7f79a83d677622c207884071bdfe1e881e79c5da5cabe1118b2a0ae
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to other PDF files hosted on potentially compromised websites. This structure is indicative of a link farm designed to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jindatunnel.com/up_files/file/82611173689.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r1hkt6f09avnd0ite5vlb6mcua/movipebepur.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/loxijizatinekav.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/wajisejiduteze.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/80336275319.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/matofo.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68189726415.pdfIn PDF document text
    • http://nature-revive.org/files/file/tamipoxugifikixivuxenav.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7fed4b92610b6530ca07915351e3b874/fofiranegoxulokizupimadog.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/29161821430.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/17698336684.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/88071571155.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wadojukanokob.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3egrpscjjg76f69e1f15k0ci69/kuwupeligubivuzenozom.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/fovutipawonaponotezuvif.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/tokagu.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31201175358.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135388b611d0---73216705876.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/rusisogojofe.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/kadazoxubezuzovat.pdfIn PDF document text
    • https://clinicscrm.com/img/files/sufegopuwusejoxutav.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/nivago.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/tonegani.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/64024305655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+online+emulator+download+for+pcPDF 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_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 16328 bytes
SHA-256: 8df997633915824fe8bd195d63813732cffefd835169a057c56d3be9a62d2137
font_01_sfnt_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 10780 bytes
SHA-256: 62600f47a27189db4c1391dc254ad1307014a117742f8b64e3b70e65464fd8d5

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