Malicious PDF — malware analysis report

Static analysis result for SHA-256 898d0060cafe13b2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-13 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36b5a9c9dc446d98b4becf2b688ed935 SHA-1: 2518eacb9ea154c5f042d2c5389cf46a92266fe9 SHA-256: 898d0060cafe13b2a5b1933b8fc5217833d0f3446fcdc079eb7fa720e977771c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://risorsaterra.it/userfiles/files/27789785578.pdf In PDF document text
    • http://sbkf.org/files/files/losigorabuzeve.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/65143089351.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/mezosimijinukosawedutapo.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/bikubopanonizuwakuvirog.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0c5129825---sidukasofowefekitobexe.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e380667ecc65aca4fc03ccb1efe9f698/87890035830.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/1600191845.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613304dc30bea---85531979707.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210907090100.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/35813045109.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/lujolapeligavugozojunoviv.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/45670647662.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/51409455560.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210906224822_iuggfn.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/52630085849.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/35840081975.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/97598435293.pdfIn PDF document text
    • http://aa-nusd.jp/7687124226.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca9ebbedf---68367308478.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/3441948990.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/57562834683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=isbn+pdf+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_off0000d41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41A 17932 bytes
SHA-256: 8598734ddcc096a8d024ee8b603892b3ff5cca3a610a17c7dcf0d9df35060beb
font_01_sfnt_off00010347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10347 10476 bytes
SHA-256: 42d5ca7ef473a589878f17dc8860b834419705324f6a522b94e359a594748599
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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