Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b014549b6356a13…

MALICIOUS

PDF

88.3 KB Created: 2021-07-20 12:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea2375260b7525a337bbea6f19155714 SHA-1: 324b4c467ad3da63f33f575e54a62f10f717aeed SHA-256: 6b014549b6356a13bb5c79777b5ee7687767a6478e4a62e48f8be428779689d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The presence of a 'download' button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution attempt. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious workflow designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://skupka23.ru/upload/m/keverujebalogodunula.pdf In PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/1045598101.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44b56965b---koxiwesinibo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15a722d2e---pebuwebemaviw.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/xiwimigefavizeladum.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ddc07ea1---fegizifoxosapagukigilup.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a5aa4caf0---39499216830.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/75572864766.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/65710748096.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/tuvefimudatisenusepiwifu.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/kafekikeminiluzotigi.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/jukaributujal.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/21989857627.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/59973412916.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/60053468111.pdfIn PDF document text
    • http://abpaluso.com/upload/file/nafubiluforawut.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9627361da---bobugafawilufi.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wipalemerojevipupiv.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/namudewesisise.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/23308523864.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v3nq28nnr2t5kb9tbecgsli17a/vajobukakegugerepatitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+sims+4+download+all+dlcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE219 3208 bytes
SHA-256: 1839c76b2ade8086d512d5ed87168859f73c77d6d56aca1511cf104d29f41e99
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 19844 bytes
SHA-256: dccf7bc49c5fd14c6e51603d2b34c7155bccbd160e0660870e59beb830802cff
font_02_sfnt_off000121e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000139f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F8 10564 bytes
SHA-256: b32c7f31e0890a6e1ff03ee3ade21c249988781d731754346aa14dd67b3e9c2d

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