Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1314be802097960…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 06:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ed62910733bd6b89bd93a1cf49d07a7 SHA-1: 922fed6d2601504dc66bbdceaeca7a359ff2139d SHA-256: b1314be8020979606a2ef670d59f8e60782a093a277580c810c8da7ec48b229b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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=first+touch+game+2020 PDF link annotation
    • http://londonjip.com/userData/board/file/pamodorek.pdfIn PDF document text
    • http://szhlfz.net/upload/bamojixip.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/37608803856.pdfIn PDF document text
    • http://irollee.com/userfiles/file/xuwoforizilumozufukut.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/sifelepikuvajabetegenufab.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/53045647525.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/vodidaganuguxuxesax.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/84855713061.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613988fe94352---mutonaluragevedul.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/rugodinotixo.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/91057361435.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/zuruvokunexusimo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/24440518633.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08cb72c87d104623b512ce93626e7e95/batalipitez.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210905_B695AE77B16A1B8E.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/418f364a2584b975d00a75352d94f68e/30740641279.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210908044447.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/36622664935.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/92294455149.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/66909134556.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133976c9110d---25152012580.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/2594496309.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c2hapfhc1c2pm5utq22mrbr7l/givig.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_off0000aef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF8 14392 bytes
SHA-256: 70f9c031dfd94fb2082c1f57ef04caf49eff7644529d4af32971f3b7f65fd1d8
font_01_sfnt_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 10844 bytes
SHA-256: 0e8ff949634941cfe74c522cbb21fd28de640a8fea54e0b137521bffb424bc98

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