Malicious PDF — malware analysis report

Static analysis result for SHA-256 685fee74d1d2e9bb…

MALICIOUS

PDF

97.9 KB Created: 2021-09-08 04:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89931572a8e671a17b738c347e714a74 SHA-1: a5182cdfded30e2fbb5454e07b0a93ea4c5f9b56 SHA-256: 685fee74d1d2e9bb51d8aa165d931d2d095ad96c2ab70232ce42e0d757e8f21b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to distributing further malware or leading users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristic findings are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://krisoc.ru/uplcv?utm_term=revit+2018+api+developer+guide+pdf PDF link annotation
    • https://binhvi.com/upload/files/motukofalajuvubobiko.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610329e4e8618---vojedanisefirefawelekol.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/96197572220.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aq7040r7muhu3s1cv9sguhgmi9/30769762765.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/82880088416.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/meselusonabexuda.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/wobutovuxuju.pdfIn PDF document text
    • http://splogservice.ru/content/file/pumaf.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3kn4dltid4bp44lt21sn6m81q0/sotexetadejexunadivafo.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/rizogidukajunujolu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/b2kbma7qpqfpgon9martfapfv8/godikofiwinivopavalada.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609babeb957f0---79843194946.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sanijafoxe.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/mexemebudosinukekibubu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a22392ec18a---karovoloruxupawijunoje.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3a709d97---toluwidelevozanixad.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/32495392437.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/eb6f3656c88a1cb9e9f4047255ddd7c1/dakakivuseselo.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/jetununafawa.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/54737136089.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/40552106274.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/jelisupusupulubunez.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77afd3ce7---30560015988.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 25100 bytes
SHA-256: 9c8e0cdb54b810036c63d238082615cc4d976f6a66591d0860e8a4e48a026969
font_01_sfnt_off00012717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12717 11116 bytes
SHA-256: 0dbba96eb48f2667fa62bf5d083030610599a2991ba39cedb832285456ca03cf
font_02_sfnt_off0001410a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410A 16552 bytes
SHA-256: 6e83665b2129d18700733f3701e866c944389b5918b42ac778994b4a186353c2
font_03_sfnt_off00015831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15831 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_04_sfnt_off000160e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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