Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d82fec450d30336…

MALICIOUS

PDF

80.2 KB Created: 2021-08-31 07:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 300d7f93dc65640ed94ff8ddb964956b SHA-1: 0932aaff2939c8265f9b331d2e678ebd99de3677 SHA-256: 6d82fec450d303364612a147d67a096d3373df195c86b701fc9e6d6de96a9d2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • 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://clinicaveterinariaalbese.eu/userfiles/files/kutiram.pdf In PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/tudanodatufidirupawuvesep.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796059ba7d3---fumovexuwuremon.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/95770614043.pdfIn PDF document text
    • http://charivne.info/images/file/6885495672.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/lenazisagama.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ksr13retsd21fskgecs88032hu/61446728194.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8017ddf3---68372990447.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/55152719264.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/vezesu.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/bonadamowokerategugoxide.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8620c51eee---71938932795.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/63963342392.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/93de2d476d4b56b8c5a1577089f13767/rorulaxegibupudolit.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c5921c6a7---mebiwuvujurowexamise.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085426e61aed---xanukaniwevima.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/gixubegesoxosejubawake.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607027c284c54---51635522632.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5724378f8---jimopo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a00789b547fd4d382191fb6ae080445b/78209479082.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/visetogijew.pdfIn PDF document text
    • http://baocaosuhoatoc.com/luutru/files/teludizirejutezizim.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/15669850953.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/bisuxas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=primary+source+analysis+worksheet+answer+keyPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/42bd814028d3a7bae2615f538142493c/kopalejofuriperisiremip.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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10888 bytes
SHA-256: 6cff5c717485c50574f6a4e8fa06c6537393e6b7c86681db9c44241a15868082
font_02_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 17208 bytes
SHA-256: c195c88de04bd235580055f0074af5a04b965a28fa3ca5ec117afa5f8e62de7f