Malicious PDF — malware analysis report

Static analysis result for SHA-256 830acb60939fd93a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 12:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4fc9d277aadc3ee9c57978f6bfaabf4d SHA-1: 7ee3b2e9525807bdb6454d31131219ef0faffd43 SHA-256: 830acb60939fd93a565998c1502a32661bc373f4ccc779ed5d29e37d0b97c9d3
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://beautyreviveshop.com/newerac2c/userfiles/file/9314915692.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/mifixojubujilevokovet.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/07/file/20210807_014627_182.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/ramujivedafesero.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/4145144938.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/87551095091.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/kemobumol.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/timulefedenir.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0eofuotrmcf8ck2isomvjhnr95/moxafes.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210611_927FDFAD9B224F3B.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9494329eb---fubadujotosoxifa.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/50884779484.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/44d529db197cdfa2a9d85c361ca8869d/bebimunolajuzenoved.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72150674626.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/d0v72eukkd1eua1lccio59nk86/60245086717.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/vusujaruz.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/gawojuwiguzis.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/tazupujodulofaduveb.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/vodekaf.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021060820142873499.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5c56a9ad---kagutevikituxefiduzasol.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3a341dbcce0a389a2fc424fdc8672716/46295609697.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a203f43fe2d---jenelozifizize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+scientist+piano+chords+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA26 17948 bytes
SHA-256: 66e444ef6c42c68ca191172f251cf408f29b0c4c41ce334cbccef523a57de022
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 10636 bytes
SHA-256: 35b4471cfd0a2f1c3f61aaac42be972f2a88278373de3fa97b23de5b7f4f4a65

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