Malicious PDF — malware analysis report

Static analysis result for SHA-256 06943ffa9ebca263…

MALICIOUS

PDF

84.5 KB Created: 2021-07-21 13:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a23b1ec471cad474e17f5bd1f1abcac9 SHA-1: 527e5fe69396fddffeb8c03a6036280ff8c0f921 SHA-256: 06943ffa9ebca263b409a7959d4aeab1511ca53a9cf3f5a3d17454878ae4a2d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/7th39smkq8iump0vekfut4r1up/28538225815.pdf In PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aee23df0d6de424ed1bc32f8f39b345f/23186600053.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/1441a932ab86376e3ebb8a5e8c7c2e34/10812897544.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee50a991977---zumobojozujefesetexeral.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae37c3081c6---18342203312.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/gixumuzalipovujamamozinat.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d444f565ff48bad719e25d430cf88baa/93059327420.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021713425209315.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/42092671126.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/rolunasomipagebiz.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738101aed8a---dedolilasizurenawer.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/fe3789c65461a23c458c567f58dd8c90/durijo.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d47e6287758---56227209105.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bd9323ec1---2607038102.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f0283207f---gajuwizajisejosizitudin.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c298f7573b9---junefa.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb6aa555c---pofemajubul.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/72712547467.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/kizetovupebizosukuse.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/nimigugi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/f0633fa5b7fb6d954b39672b2bcd555f/rixevemumasevixazufemur.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/81261935024.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/22841012331.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083700b315da---3904138700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+repair+a+bow+in+minecraft+using+an+anvilPDF 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_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 16780 bytes
SHA-256: 2f045c6b4f8cf2cc43ea8575b611cac846bdbfd86fc2828ddabcbdf4c30e7632
font_01_sfnt_off00011248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5F 11204 bytes
SHA-256: 8ffe0f321a4da7da04bd69edaa652b7aa36757a075ebd319ce6e0a7a3c83d35b

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