Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd981d1cd183dc0c…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 03:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0ddcf640ee36efb0377d89475b69044 SHA-1: 9eb47b32ae36b707c6e0397cdc010ec5e5ad4e8d SHA-256: fd981d1cd183dc0cac5f222f8bbdb3b71a10c7691bfad067d4279ab61214ab9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of external URIs and link farms suggests an attempt to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=gout+diet+pdf+canada PDF link annotation
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734ce90b896---nepopetajo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5baebe2cf---91698175685.pdfIn PDF document text
    • https://aspirans.com/files/file/30382851368.pdfIn PDF document text
    • http://recviem.ru/img/upload/zugikuzalababe.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/60152757291.pdfIn PDF document text
    • http://thebranchoflife.org/clients/3/37/37a84c4c47f147f839b5d5a44bb1b86c/File/lunonobetixaloru.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/zubivagodazigetimubiwesu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/heu2d5oj6o6avtvkakchj1kc01/55824267514.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/visadikavupamagome.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/faxolab.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608acfffd2788---17083361411.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/xajewivafita.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/lowovegojese.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/vizigegulivakis.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/nasuva.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/kexefedezuzirexufaro.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/65656981863.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160983dd55d096---92921708176.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/79874889693.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160767d3688932---sivezufesusew.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/4prte4vf433tftnj0ao3m3u09u/1356150730.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/juvelinunovarozasolu.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/0fed976c126733086898da449474fcf0/dakasoxowalafiwomu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d79a64c2fd8---bogemijuredojam.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/78864155772.pdfIn PDF document text
    • https://menu2uplus.com/images/file/46169192955.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 10440 bytes
SHA-256: 33de74a1a1b4ce11fb637d2e9e0028a57c2bba59a3ea1aae30b6e58cd3641eb4
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 17580 bytes
SHA-256: 672084ade63075f4fe22828e5de3106f0d398c1605c56c754c3eff12d509ca15

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