Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd948befd1f23282…

MALICIOUS

PDF

73.6 KB Created: 2021-08-14 07:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79f180a385d88af0458a65bb6391ed11 SHA-1: ac0a79d19e4f2dfd8c4eca5252acb74a7e44d39e SHA-256: dd948befd1f232821624606416022a1eae1b6f3ff2ff95e02f636625160284cb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to disguise malicious activity as legitimate document delivery, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=grade+11+business+studies+caps+textbook+pdf PDF link annotation
    • http://valsadindustries.com/userfiles/file/xowenukanejajolirelakuwen.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608432b781f45---nerewulobitekawajomesira.pdfIn PDF document text
    • https://soechi.net/userfiles/file/45525496780.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ba29a4c16---82922850254.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608c916db3e0e---61433864567.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/zanosufatobonitizudix.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gbstjg68ekdrkgiusda0in3i5l/navikuxuperumolaxut.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/98491562937.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210629_1FEC9F97FBDF211F.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/gusujifomaj.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/jofefazopinowur.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/992c004e04a9d574e32de294b03ca94e/65107488557.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/misovesidaladiv.pdfIn PDF document text
    • https://bloomeng.com/uploads/98069788222.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bde6d26c5---47586116351.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gexojovujovixaxojipodoro.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/56a7009a3840f15cd2fa9fb821be520e/41726589020.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f456f204---vatekixedimovo.pdfPDF link annotation
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/94377407178.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/81272788630.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/jalut.pdfIn PDF document text
    • http://findusafranchise.com/files/files/rojavixatofaxe.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052311515896.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_off0000bb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB21 11092 bytes
SHA-256: 3c474684e894840ea7ba9a739906f3390114e6269bed49d382df2b6a91aa5921
font_01_sfnt_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0A 16260 bytes
SHA-256: 935b371c639e56bd158e20ec32dccd119eb8320e467c1eb255d1c02b49e8ba40

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