Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bbed9b9ef281fa…

MALICIOUS

PDF

100.3 KB Created: 2021-08-16 16:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07d85f12fb1b32b34f3654dbc0d76341 SHA-1: e24c42dbfc9458ed558660ec9d6f1fe48b7d2a76 SHA-256: 40bbed9b9ef281fa3cb5ca569ce2008fd79bdae33a0ffa9bff551fe9ed747622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document, possibly delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ed92427d---jitapuji.pdf In PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/13240786081.pdfIn PDF document text
    • http://geraldinekilkelly.ie/bejedufigejose.pdfIn PDF document text
    • https://room12shio4.com/contents//files/1014307165.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59479038228.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb12992eb9---tofotituzejavog.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402d594a29---6878161262.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/3ef068b3ec5b96bf52cfe6819b148c3d/wofetefutin.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/tinavazipeviperag.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/47159948499.pdfIn PDF document text
    • http://tion.hu/upload/file/96652964561.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/mumikekexulivafofabif.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/20731850130.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69190922536.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/22412812107.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/36596293133.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/m4a5a82etjk7a0nofmuk5gfbq5/kipojatomozikarubiwa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/49bbb115a961a770ec0146ff249a77fb/39691048445.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/futefapexi.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e75bac7cde9bffc7d8e35f8f9c21d392/kezulegoruroxax.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/1b040de94edc83579e2958bf87c398af/faredalos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=estudios+b%C3%ADblicos+cristianos+evang%C3%A9licos+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 11300 bytes
SHA-256: 1f5d70f07062bdda8e27e44312fed06953bc389385e0cda0dc125eb6c9e0ca15
font_01_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001527f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527F 18548 bytes
SHA-256: da88106733c72ca2f54a0b1ce5363e011cbb8988d8315def753395eff6709f8f

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