Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e2e5a20db0f62d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 13:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff5309b06ad535609013b8fc44a68a29 SHA-1: 969a3f97708fa1d2d9c186ff9bba79000007ddda SHA-256: c8e2e5a20db0f62d49faa60789d9706a4b26ba727f462cfb584c49e00ab3eae9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tuptm68t0c2cgem18s5pkbk5v1/xakulabisawuzefajula.pdf In PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/45781433893.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/8688479310.pdfIn PDF document text
    • https://noddy.nu/images/file/xorizijijidofilo.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/56911543520.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/wirobew.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/41402683969.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb7f51336---tawikaviwez.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/77710394838.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f95164296e9---molepexeramunifasaduzare.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/82580467525.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-26/images/files/7073152640.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/nupafaxufofaxeseke.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/luwenalopuwilonojijus.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b3384d1ddae40416068d05e32b69052c/63497276986.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a79940720ee---dukulezidogesizi.pdfIn PDF document text
    • http://teakdeck.pl/files/file/jadaketuvedozojamejupiraw.pdfIn PDF document text
    • http://mav-auto.ru/images/file/dowomisajaz.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/pononivupizabelakakudi.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/wapukedanupetu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h98qpf5k9g8n3l32m9rht808u4/vulubudinegem.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/96516487596.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/42077024907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=finding+the+unknown+in+multiplication+and+division+worksheetPDF 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_off0000d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E4 17832 bytes
SHA-256: a53775c791df046f8725d502cfac3c11b98d74561525fb2b78faec9e63f1d36a
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 11284 bytes
SHA-256: d0de16a9c825896c87da38a4783b3f2edf78d70d5bbc52c1775f3898915e2762