Malicious PDF — malware analysis report

Static analysis result for SHA-256 0377d7bb0cce3193…

MALICIOUS

PDF

69.8 KB Created: 2021-09-29 11:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 356900811e826393aa465f199fd8746d SHA-1: 6b59374be1844fb361db82fbfc490e0897591e8d SHA-256: 0377d7bb0cce319313b512017f2c1daa00ef2b1549fe2e0fe98295e925f3e5fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://coretry.ru/uplcv?utm_term=how+to+stop+amber+alert+on+android+phone PDF link annotation
    • https://cplastik.eu/data/cms/file/5902331082.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/25811945994.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/zasev.pdfIn PDF document text
    • http://machin.kr/userData/board/file/jawiva.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139aacde5ec3817fb7e1548b93139b8/16259598079.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/36595680855.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/tibobelixivajakudok.pdfIn PDF document text
    • https://12shio3.com/contents/files/betakexuzopadalodokedu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/20839906005.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/31516582888.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451b0b9098f---97796087758.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/90223334004.pdfIn PDF document text
    • https://kueapem.com/contents/files/71608386591.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/webebuvuvaxixuzupuselipud.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/milasepigib.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ed862543af9a73a4f54c8a827787f1dd/lezesirulaveteketukajamu.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60858953747.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/49626208191.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/76281019458.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/durazo.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/puxegufilibapo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/50878313053.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/uv9bo934ta1ih8075rcstlf486/fereke.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/geruwudikomaro.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5avm895a5t1vgkgkn1o8rurshu/91831928866.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/telajadepob.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/rurepugasanagabagowo.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/60316740637.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_off0000b3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F4 10876 bytes
SHA-256: 52b8642b9c2de8bdb9f25203ad0a215d04cdf6431e5115417874108e9fb51b2b
font_01_sfnt_off0000cc9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 14552 bytes
SHA-256: 7171dc6e74ef6e40197390a7efd4448f49c17db3a955092e78ad61c943035aae