Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d36b88ce751cdb4…

MALICIOUS

PDF

116.7 KB Created: 2021-06-10 04:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 819d31fd483c93b1465fec7fba3dd693 SHA-1: 74d0eaa0c7976b5c0fd35add2ac807cb5493d14c SHA-256: 7d36b88ce751cdb4803a0f38bb622affcdd5ea4fdafbd3f9af7a2b689c1b1040
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and the overall structure point towards an attempt to distribute malware or conduct phishing attacks.

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 https://irlanc.ru/uplcv?utm_term=soorarai+pottru+full+video+song+download+1080p PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b439740d91d---repiwuxufalupomev.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609059a5b4d65---pufuludut.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eddf3f3f51---besowokogipogamugudulirif.pdfIn PDF document text
    • https://starbox.fr/img/files/dumewezika.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/713bca491635ae1f0490f3d4c7559d33/kozenapigomiteludavekule.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b915456af---68545008813.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/mk9dmlnqt2u2hshbs9kv31t5ak/lurexipiwa.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2d0e6a52bd57a3bfdd51d16d42bf1df7/61658559807.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2923b09a4---30993743465.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/lepisubojamurokegej.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b77e7f7e8a99d1d889e0229f3e861e6c/50079251447.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/53003924750.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b35162a42421454336ea6cb8dd844321/92244285900.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b42523c302c---ripisadog.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/foxitidovatomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF2 5852 bytes
SHA-256: adf2d544042bebdb94da438f0afe877b4b6f580810314e8748623ba257b840d8
font_01_sfnt_off00016101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16101 7708 bytes
SHA-256: 33d9297a045d668ce58354c4faa62111f4ae3f258cb5b70bfd56df5058109a79
font_02_sfnt_off000177a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A2 3620 bytes
SHA-256: a1d4a2622de9f53e498bb963fa9a073973cce0cb5a83c22cdb0edae1a1e0ba74
font_03_sfnt_off000184d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184D9 11392 bytes
SHA-256: a1a03a9367d7f851d47a03e0c14fd0b04b2f19493331d16a9f56ecaa1af70612
font_04_sfnt_off0001ab9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB9F 17232 bytes
SHA-256: f3f65c7a55d900acd083252e7afc4673232022fad414c2c7ea70d434c6107f81

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