Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93c9f6f72f4f907…

MALICIOUS

PDF

76.7 KB Created: 2021-08-29 21:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49dcd23f7afed03d7a06547896db86a1 SHA-1: 3f92139955e526c00660c5de3103a2b9a92b71e0 SHA-256: f93c9f6f72f4f907858fecc82aaa65be68c73cb4581c8724093c79e30f9354ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URLs embedded within the document, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=simple+braised+cabbage PDF link annotation
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/46996942250.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/569654c42e3d982d3d13047c9c955eea/segawositubim.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/simidixapevo.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98d61a7ee3---tedejojovofozapofuzeje.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/edfa729600ce30ae2a46fd2ae4e6ff70/83442491940.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1626569309930942075.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34e882911---waronavisivigeta.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gejebonatexuv.pdfIn PDF document text
    • https://immobilgold.com/file/ledinemafarabuvu.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/21637888677.pdfIn PDF document text
    • http://terminsk.by/pics/files/rinob.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vuxuluzak.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/1d4222145c85b5e8d9e909cf5ab394f4.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/3185650831.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/xavewutibu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/0i5qc6s704uqobbv18sl7d3udr/85012492466.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/26409746807.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1adf21cc79---41275341999.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/xagaka.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/busavamokomonukunowowavos.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/sibipegiveguxenogog.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/v9qou76d68vd2rus1souo6rmvu/fenaposawiro.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/31039da16055edb72f0538645ff3c938/wawenafaralir.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/9c04454bf9964a0b27f77a43154cbfdc/24556426509.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_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 16440 bytes
SHA-256: bc7e71efc99e18428da20d125fe148cb8a84a5317df932e8db28e46da6960c7a
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10748 bytes
SHA-256: 21b6bafafe2d3b32489c292bd840220838c41ac6e417531e1690c08181cb1485
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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