Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5c4c2717660eb3e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-07 14:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd4d96c2ca87aa2237099c79db043ba7 SHA-1: 7f41d9be45cce41baf397c4980f9fb890a8f05be SHA-256: a5c4c2717660eb3e5667e8f46d684c0732a6b8caf5cec5722381cf2c4401f381
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading malicious content. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=how+to+bypass+account+recovery PDF link annotation
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/cf39d8283443f4502c2dc1656e181650/dafurodopopenuvezasafe.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mchtd0m13nuqi5bchi59084k4e/80441058216.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/70971719855.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/puxuxavizutavopegusikixew.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/nonobojewuzaxubelefumor.pdfIn PDF document text
    • https://stopserv.ru/files/file/tifugutesoviwuvurefeb.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/vuwadugeded.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/78969980888.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r0hjrq3m405tdkedneo3oqmie2/nuwodigodakejamatomupupem.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7e99a63e---29944772689.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/24426820951.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/18054856170.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/80429363730.pdfIn PDF document text
    • http://modero.vn/upload/files/14699304228.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805bfe9bb9a---sinopuxa.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/bofivobazesofadogifo.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/32426730727.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/vejoxeri.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/d85h7rl7m5ucvq352qp7ilb4a0/fafojotavomebu.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/nolomigabagirudine.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/60207929425.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/leraj.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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 17228 bytes
SHA-256: 2244d601bc15cead89f94bf7ba6384e678d011ca249d442a6cee9253fb1db10a
font_01_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 10724 bytes
SHA-256: da05fe3f58ded6c495ab251a4841091c2781da40b2ff6105e84d4c85e463b551
font_02_sfnt_off00013c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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