Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c240a6e4a4692…

MALICIOUS

PDF

99.4 KB Created: 2021-08-02 17:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ae87caef4ddab4b7b8a1b4d57a10578 SHA-1: f4d9a511fe89bd3de03eacaba08f0ad6b339b93d SHA-256: 7f9c240a6e4a4692b489d0b905c33ff41ebd9d96e80b510eb674674cd4145e58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of links, many pointing to compromised WordPress sites, suggesting a phishing or content-luring campaign. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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://studiodispirito.it/userfiles/file/67826012315.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vldid50dshqc8mkb02hc4nm7rn/72121299666.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d498c419---nokar.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/savolokenelorozuxu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/nazukatokemolafuxaja.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f3c33ef9f---65514849684.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c767d32649---xejusawufenabi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/728f996eb1913b730e4466c7b8f7d437/nelulobaparap.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/55357774215.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070301512197.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2819034bf465e404dc2f6ad89fe567a9/67969452469.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16091850c140f5---notijeneposamut.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/57abce8589b08f58ac5a8bf9ae9578a9/vamedudogaxatamuzi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6421c70c9---9426740035.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/4b1f9a4fd1008e8391f472ae9cba99f6/zidojupikuwisixekabikedew.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lufixajasevo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0bf942fd3---movesibapuvabinegokeku.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610761ad2e671---51489462661.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/87570815143.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20a0c05c1---lipaxezewapewazeleraz.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/74439552902.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160981bc6eec8f---55349123715.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/33503570425.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/pideji.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609133c98cce2---86411965479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hp+beep+code+3+long+3+shortPDF 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_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 18228 bytes
SHA-256: 209d9f7f5a08724ec90f42fde7c5f2223f83843b566ab245d67c44dd6c969732
font_01_sfnt_off00014f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F9F 10840 bytes
SHA-256: 156b5ff85ca01b7a646c1b82a0076a5c5598c6a603a2afa803ba69b8229ee4c3
font_02_sfnt_off00016826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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