Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d8e860d80f2506…

MALICIOUS

PDF

73.7 KB Created: 2021-09-08 03:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19939d638eb50476ef4b1617cfb630b1 SHA-1: 6a84c49a50ce683943b82b41e7bbeb1e874e28f3 SHA-256: 58d8e860d80f25062eb7e3c8a4acfb9cb25d26a0ada83d71a5341ea64999daee
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=wig+wag+lights+lspdfr PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ac7ab130---laturenitopirin.pdfIn PDF document text
    • http://shimoltd.ru/images/file/93221702471.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/22417900827.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/putesadipinejinunan.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de15f10a690---84097914797.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/80839931353.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/48222463971.pdfIn PDF document text
    • https://robertbah.si/files/file/96413725719.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9tchvcb7lp9qbts6qv6bbe2a9o/57285390970.pdfIn PDF document text
    • https://cncunse.com/d/files/31498394588.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/58b185bf1f93cd8bfcbb3ce07585ac86/xaxaledifamesovomoji.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a66bc6706---goxabolatiwipukujolo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eebd9f54---wunofoli.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/lupuborixagefezu.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/tovujelopiku.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d3329qppddmhsovlfkgq58vhu4/68109871394.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cf30a749c---75066922870.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8094c1e---junowuniworipoludatoru.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/42301566040.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/54121771321.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1af20fc84---18096796091.pdfIn PDF document text
    • 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_off0000bd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD09 17808 bytes
SHA-256: 383203ebd8fae350f8fceec8fb787e32c188a019401d9bc4b5fa380dc1ac7693
font_01_sfnt_off0000e9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F0 10500 bytes
SHA-256: eefd98d248523abb9576393002b2e537da03d70b2efd566df6d76b1be8de667e
font_02_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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