Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e4dbd3f91f705a…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 13:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1c09a0514b5782968466a8ccbc98569 SHA-1: e5d87e98dedc24263f3d5e5c136994f9ed50f96c SHA-256: c7e4dbd3f91f705a42f24ac28f6556e8406bd86545463b0c1866a96b3be4171c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=tujuan+gerakan+literasi+sekolah+pdf PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/2c9d8f947f817ffb5650dcd3b739f1ba/53893638102.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/razaborarej.pdfIn PDF document text
    • http://bubb.cn/up_file/file/76212985514.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105f018defa7---33913339491.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/88439505413.pdfIn PDF document text
    • https://strechybenesov.cz/content/zilume.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/688c48c7bf5d25efb107ad408e3b3081/budejusovomexaver.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/bupuzotibed.pdfIn PDF document text
    • http://silver1979.com/upload/file/forafajolikubusu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/talugireniba.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8649fdab16---xalexirezuratu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/taxumavaberozolapolalukuk.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/49336f9d7add297c87f35d896c552649/vivipolep.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/edd615c8929ccfc997a4ffeb78a28d4e/vadatidederakujito.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wefuxebunu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sarazapijigini.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/24655915705.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ab9d8b11f---zudarajufozekizute.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ed0a8c0db---91243044370.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/namonudata.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/molekumagiponadosajejoz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609c29130ccc6---falexusilarapuvij.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16040 bytes
SHA-256: a860e8fb08624f5e7952a70ba6527d55d567e48a8e26f299ea43fdab9101844a
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 11064 bytes
SHA-256: 657f4c6654f7a94556264bcea3cd6224e2f93c514c2424d80c183ba51ac93266

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