Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7b029857ceaa8a…

MALICIOUS

PDF

86.8 KB Created: 2021-09-06 13:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8878f01999e66756d67eace0bba79360 SHA-1: 09f99ef77021025652845d09e3e629038330f796 SHA-256: db7b029857ceaa8aaf0f7579be83d533b56537f17eb57929509d965f1112ef3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF strongly suggest an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82f80b7120---88761315991.pdf In PDF document text
    • http://inoxbienhoa.com/upload/files/66475748949.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/satosavibelofefizaravo.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6749cb769---14940818594.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aafc35979---gunizoga.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31752848244.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791609c1f31---zaletuzogibovemiw.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/66060373927.pdfIn PDF document text
    • http://zaiger.ru/img/file/xolikufulisu.pdfIn PDF document text
    • http://short-story.ru/upload/file/75682088823.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t1422ceir2n442553ou87joqsg/kopis.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/11821467636.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2af9681d4---79081219893.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bf9b41d548d---fajisivupakexuzinitodabi.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/68811049178.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d871c0af56---41446057616.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9da27198---regigusasozifasup.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/34685393171.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3d628004aabaa6d3834b9468dd633bd/xupasibasudulatopivib.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a8919e1bc7c59d0172dd78de56d701e3/98479254596.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/36899903045.pdfIn PDF document text
    • https://coil.hk/upload/files/54340634482.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/p6tq8e7a2hi5ad98b3sfcfmo37/88290118340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cyber+security+questions+and+answers+pdfPDF 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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 18004 bytes
SHA-256: ca54cb9ea0cbc7f30e6c78a897c68d714ebdec44ee3c738aa3b1146fe52a17c1
font_02_sfnt_off0001339a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339A 11184 bytes
SHA-256: 7bcea089a0692b6c348fd1562cf3c86f47813122a6917d30ee309ad14ddae71a

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