Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0bf423ff05e3c4…

MALICIOUS

PDF

80.8 KB Created: 2021-07-04 03:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2d1ee628a95ad908dae70bc0a476707c SHA-1: f80ab55f3989d4c5e18002f1b28ff38bd74d345a SHA-256: 4e0bf423ff05e3c4a4be7f19d82d83a23a0fb0e77114bcc297825e4083d47ea8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=subtracting+like+fractions+worksheets PDF link annotation
    • http://volamtuyetthe.com/userfiles/file/94392311410.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/88538148360.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5565d1c4---seponinesixadi.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/36f94bf3cdfb92771b04dc45346c1501/27606943169.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/cc6c8d83179f8a019fd8ee072202dc73/zilodaki.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/16945050105.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/fedagenatokonozafa.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sumimipa.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/44074013478.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/76833071404.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8f723a8bc7556a663a67488b74f1bd75/29904578215.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/ruxexubamadefezusodag.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160d54beb788b1---wunoni.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7c0e04a733fd65bf4a6c9786d8a79715/48581567930.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d6f4a4dd2dd1f800e90716cc6d93e59d/lafavopukiwoxeribux.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/33810870124.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qkj1sfo6p5unnvrdm3udg85hak/26807775745.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wanogaderugenamot.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/bb3d384aaa13d7d97929f415f2ca3d58/71907677856.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/420f0758930da14d166ed47180615db1/59167323416.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106300508452617.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608485e3705dd---26845647267.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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 11108 bytes
SHA-256: d5823c05afd8cdb1c52139e0b9ccd43905bdb65ddddf166063ea39e8ea6e9df2
font_01_sfnt_off0000f203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF203 16916 bytes
SHA-256: bcdc88aafe61656333ec678583d9ea67e180fdeeb7cbea6d38d77ce23135e827
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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