Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b4d5d7acad4865…

MALICIOUS

PDF

88.8 KB Created: 2021-07-05 21:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e0e11597bf37e8b0e064a433cf478f3 SHA-1: 9a1263d683539214792e4930e6d0e251a633579d SHA-256: 79b4d5d7acad486552c19fa7f4305db7fce2b496ad35bbdb759771ae10fe7329
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f435abc3---lepelinipozoziwixot.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/34412634688.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/56083964370.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609599ff18464---59202729446.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffc17c7e5---15061795899.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/gelawamarowozemaxuwulev.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd07aa3628---viforefewofixam.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/tanuresesilidafawufuz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/melukopirapawakusuxot.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/92698819664.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6c1a4b01---15282958902.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/milibulolo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839f67cfac---21544247378.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9e3f1698a---goputifosumapi.pdfIn PDF document text
    • http://gakuso.jp/image/_ckimage_file/4764426780.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160742a4d96c13---lavipomexobirexexuto.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f38ehsibma95a6ph3atbrc5ks4/70249974347.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/pixozosoduw.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6382880797.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f2d42dd5b---revoxajunebona.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbdc449718---53133695833.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090772c62c16---98055403131.pdfIn PDF document text
    • https://marosme.ro/hirek/file/87846893186.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086c891dd0b1---ladovepibuwigaret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+numbers+are+not+prime+or+compositePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 10824 bytes
SHA-256: dc9ae8790a1cebd144884e13b1605ff923d192e2a8601a0611aa628959e4c9ef
font_01_sfnt_off00010eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 18000 bytes
SHA-256: b4eed03b8941a26e8ddaaf033c588c95d45260d8d762726e74185c24d0c8bb2b
font_02_sfnt_off00013ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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