Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd581ce66c84a62a…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 14:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 366101d860df9839cff22de9333fc5fe SHA-1: 5427d12dcb2b8642e64f253a74c44e774117b5c1 SHA-256: bd581ce66c84a62a5e6fef4cf701c8d53fbcba1fc2e4ea3389d8ba8b84682ed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://manpukulivermore.com/uploads/files/molejizidotot.pdf In PDF document text
    • https://anaksemut.com/contents/files/47148705778.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/belajodagakirav.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/papigaxewoxosizikoga.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/55089506978.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/863065436.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4de5b5a78b0b0f66455e3cbf3d43fecb/wikosawaretuduxapegiwupum.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/57323752343.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/1669399968.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/58397692008.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/minipezufixa.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/4753833083.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/1250234344.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ba978c7c56539352165a27b99736ca5/nasenuzodiv.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/lidegewamifajoxudaz.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sagola.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/92020458621.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/99396300136.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8516264c5---sifutirakap.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea3f6c18c---tizumewebuj.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bfce4e8d---45122261738.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae64aac82---matogaminazuzajegux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+photo+editing+app+for+pc+free+downloadPDF 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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 11036 bytes
SHA-256: bc622f84c8189c6420b99efbfc27d89b0b6fb5cc8bc2e1ca9ad70fe9a58fe9a5
font_01_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 18176 bytes
SHA-256: 88e2532026f435cfcd30e1db28122fcc777faacca69e3d9fcb5565be253c652a