Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7485e4083c9cbc…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 05:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb6616be3352c736026638bed01ab43f SHA-1: deef5fa17e885e0e910ad197e37e8cc0a7b3b934 SHA-256: 1b7485e4083c9cbc48fcfcd8c9b6233282e396032f4fcd09ba1e075fe4edd156
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, with several hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://sanitaerprofi.ch/fckeditor/editor/images/file/10902644565.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a3e01a576---18646712203.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6ofofhi55tevrg7cf8vab9vq0b/979623602.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/kojukuxeburetifeleve.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/keruxuteba.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/61311623305.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d41471e9ede34b65ce5be2363299018c/51601685937.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/05h5bdkcud4suqk76cuk6linu7/39531431773.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108443ec26ef---wogisinemufupetoxo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf03e012c---vewemofejidedegeza.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2beb9f312e2d93a649867fdc877e10a9/kukamug.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/75254213567.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/tarilib.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272c78cc781---kopokavan.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/45fdc093d38c75386926ebe5183c4a1e/85679154436.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/97358305364.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/89500108350.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be473b22d9---29041450445.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/tagazizaxusanedonaz.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/tuzadetarezeger.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/22313922889.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65761207478.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/xafulup.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/55432418882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+use+of+pdf+filePDF 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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10484 bytes
SHA-256: 4aaa50e94f1bfcdf06c7144526a49c17dd13c5f40cc7220135665190e7d57207
font_01_sfnt_off00010189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10189 17796 bytes
SHA-256: d055e33df646a8f2892d924b9c95c1c8c468ecebe3d290ba05963a8acaa3a22d
font_02_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1