Malicious PDF — malware analysis report

Static analysis result for SHA-256 771b5da3e865de06…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 05:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b7398f391ed829839c80ffe707e4ffd SHA-1: db0e836722c26f8c294b0d40e82c91fa17fb9336 SHA-256: 771b5da3e865de0655f70b99dec39fb00a3c828a44d2ac145b7dcdef32470943
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristics confirm the presence of external URIs and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn--tnqz8hz5cb8l.com/upload/files/36754891322.pdf In PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/dd4b846094cbe8b07611650ec9d59175/vejej.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/sibuworileli.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/37912642879.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/zabeb.pdfIn PDF document text
    • http://pneusmarene.it/images/file/57412676930.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a155726e91a---nugezagasinubilev.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48637acea9---tufefiwetipuxirisudidanaw.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/rifologowesajedewulugij.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/33085002726.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adac5050473---bipivufadusu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8f3501ca6---45749429413.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39abb3686---vejododejuwubafopozis.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/65542361274.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16210604821107523669.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a298272d163---56030810554.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210624150017150163hotoz8uga74f.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/30640676806.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/75338069639.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/43532687408.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430211553262708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=firma+digital+documento+pdf+macPDF 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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 17944 bytes
SHA-256: bada3553729e47184d4d08a7207929e4391dcf3af616c8b25fec3c3eaf169484
font_01_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11715 10872 bytes
SHA-256: 0d2eb9e102c6eaf1fc54ea4abf704ab996507b0450d97a9c4aa4784a9fc66e00

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