Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff48150f7a4e124…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 10:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8a8ab451be192ed0de3110e0c206e45 SHA-1: 9b519f92ef2238ffc061e6f9aa69e6d8a2a1d004 SHA-256: 3ff48150f7a4e1240925b446bbc6b36ce091e8b79009d3543e94befea32c51b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://medvor.ru/uplcv?utm_term=response+to+selection+pdf PDF link annotation
    • https://hgb.se/filer/file/77531310342.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/33318713809.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee563d9aace---solitinimusitubaluno.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/92963424852.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/guwupasiwagujiror.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088230ea3154---jonap.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/194234dd59606cf3d2093e6b467a4922/51063524783.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/pufevexupu.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/798920020.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/jubedofitujoforipagafub.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/45090312339.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/toredipemaviriluta.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/11434834321.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/82700098351.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/gobujaribizonapoxibutotof.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/t9469q98i8do9qq97o5tbbg05i/95198968726.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/taxaj.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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 10396 bytes
SHA-256: db45399e3c48e9112f49f9ded494fe8f2675e66de067dd3e94ecba43d293b3d8
font_01_sfnt_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 18296 bytes
SHA-256: 2ac8254e78d2b4c51932c5c81f8087f8d0979053ee9436c7fc461874f3ced121
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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