Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d7fd3e7635c7d26…

MALICIOUS

PDF

84.8 KB Created: 2021-07-04 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a075ab77b1dd73797b88ed62a8be09fd SHA-1: 862c5d3f2db47e1d2814cd3bd6b81cb95d5d1611 SHA-256: 0d7fd3e7635c7d26142f2e529a4f57e64984a7b8d5d5e6052b5d5d671def1f28
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tort-art.ru/userfiles/file/zepoguwixisewupuso.pdf In PDF document text
    • https://solo-enoant.com/content/files/files/zuxidisevozabeviwusikoge.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/wefutuxuzowoleziwowam.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/tosejanematupilemukemusem.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ep6ht4c8uhftfd6ncacvhfglo5/3544379928.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/eb1c2c08e501aa53207cedf8d20a15f4/13473626920.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cf39ac03ff87c5020a7324a8770b6bce/fumigodemukago.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/80393718119.pdfIn PDF document text
    • https://avflash.nl/upload/files/lifitupagubib.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a428f0e09bb---tixapigobobirozepixen.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f5b00918---jugigu.pdfIn PDF document text
    • https://drlanda.hu/user/file/zagowisozanigozileboz.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1657043e---64354080047.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0ad2969b23053ed012194af89b281c65/31292101298.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9645f063---zewujikerolomosuzi.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/lexop.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0aa0cb80---nasowuf.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o4meqi2ler8bimsihsad8pubnr/sajadoroke.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755844128da---rapunus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160763fbc7b293---posiku.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/75675521857.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/98871571763.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160806cf26d773---151653973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=they+that+wait+on+the+lord+scripturePDF link annotation
    • 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_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10872 bytes
SHA-256: 72ab6247069a8606fd5eef3667436ecc16a35e13c8eaa43f97b189b2b475767f
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16760 bytes
SHA-256: 6b0c006a4eba480eb1b3029c5cfea0eb50d727ae24f048e0563a0ac3cce8c2d8