Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9633b1e683cb5f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 16:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02908d192c84c0e1a8ab01d0de60f35f SHA-1: 8e909ec91329a361b7e2438893a7380919c5a86f SHA-256: 5f9633b1e683cb5f1220dd92f807f3aaca2a66303cf5a44d2a8df0d4fc3decd2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=yellow+solid+color PDF link annotation
    • https://appvid.eus/userfiles/files/89539204836.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/manemuluwavigofiwiro.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a0e0804884789572594f83ba915464f/51555472483.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3e9a670abc0f1d9b2b451ba1d198948f/71883586051.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/92709621284.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1ab0d00c---59784141845.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0bbe0a28---bixisavi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/nadida.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74269992145.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1cda960e0---mujareralotuzerefap.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/98454099311.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/bopesowizazuvevesepenavub.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xuziwa.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/watufa.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/38893811513.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/87411144483.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021852334202193.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ba20e7b1---xeruraradesuxomabenevumi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe461dab7---zudok.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/sawefaga.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/punavot.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/43862626838.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e04972f2dd62c7ebcb676d69333fe64a/75573097129.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/00dd46d5f6a63f1d9ecda355856eaa17/80185938046.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_off0000cc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC11 10068 bytes
SHA-256: 3f8f663196480cdb4d87970c5623c51eb21484deb5ac7f426b4d2054b402bbd5
font_01_sfnt_off0000e297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 18092 bytes
SHA-256: 31ec3f7141d0cdcafb97af6e89c8bbefa7d0c6c3231c477f6fd873fe1e6d7ecb

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