Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfaebc844105678…

MALICIOUS

PDF

76.4 KB Created: 2021-10-03 19:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6040efc4969bcd6d44890d39199cb949 SHA-1: 35ab307550815bcc69eb6cad1a1c161883280bea SHA-256: 9cfaebc8441056785589a3ae16307f50e912a38a2bb54e6983ae477302e1a065
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://infrive.ru/uplcv?utm_term=eagle+scout+service+project+workbook+2019 PDF link annotation
    • https://next-engineering.com/userfiles/files/20300193045.pdfIn PDF document text
    • https://kimansion.com/uploads/file/jomametonukafamejupik.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-10-01/images/files/vorav.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/jovenitetuzuguvipuwotor.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/lejudupozotur.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/giterinofegebe.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/46779574230.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/58877355455.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/49382667360.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/jutita.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0ad594bd---xonisirulamu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/82748798.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/btd5tgkjrbp75tvj8env0hp9ld/52315601211.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/99617485800.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/45289165603.pdfIn PDF document text
    • http://montesantangelo.it/files/files/kulamekukugijerut.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/galixutaferuketot.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/tilodegivewafimilezefo.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/kubedufosaroviresejiw.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/viweva.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/58016684510.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16152f83aac942---nabumavusixirexekeg.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/83157682012.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/18291450764.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_off0000bd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 11504 bytes
SHA-256: 6ac67605fac5dd99f10ebe2650733c2e4df1913b2d43d7e8c25304c57c85713a
font_02_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 19252 bytes
SHA-256: f7e4052b8f55a3964863d686a12924d43d0df5a92cd456aa0da21718bdc45109

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