Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1b87a1dc683ca…

MALICIOUS

PDF

91.6 KB Created: 2021-08-17 04:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62c2149e47998cf635f2f20c3225d37b SHA-1: e103c5cee23308f9b6070f51942edd604e4d4ffd SHA-256: 05b1b87a1dc683caa3de4dd74eb208582308d9389a773e57634dc5242cdbe1f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://inwebjor.ru/uplcv?utm_term=notes+from+the+underground+analysis+pdf PDF link annotation
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ae8244d932---39638246081.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/62769907980.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/divok.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210628024442_khhytg.pdfIn PDF document text
    • http://asustainable.com/global/file/zuzesop.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3aab498b479c904fa104025eabe51f31/kozifemowexitijivemibu.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0e36e97ja0iq1g7r8lc4575h11/86089001530.pdfIn PDF document text
    • http://roocenter.ru/upload/file/didam.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fcbbf11829fdc20cd621aac081ed607a/35638362705.pdfIn PDF document text
    • http://mmt24.ru/files/file/55108006633.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad034a5acec---37362776058.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/muvamipetafesosamatijepo.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/68826663952.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/df170469144d10ff19d8aef4aa7ebcad/korazujesilejadapom.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//70488864395.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/36621906213.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/8107200478.pdfIn PDF document text
    • http://gibisch.org/files/files/79547773817.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gdec643qp4q6ktca49k644pm85/57315612134.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/57757616960.pdfIn PDF document text
    • http://sakem.org/userfiles/files/94894414247.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/29508068884.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce70142751---vigexegofajujimudugakenup.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zeloribegojobafamiziv.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_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 11136 bytes
SHA-256: f523ca4def32c339d24d1f64cf1ebb88f65559c2f8a2c645772255892ab5f585
font_01_sfnt_off00011c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C97 17008 bytes
SHA-256: 724b541cccdac6f77560e97402dc44c1790c40913d0ce05663423988dee5bfd6
font_02_sfnt_off00014838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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