Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fdf613d8dab0da…

MALICIOUS

PDF

83.5 KB Created: 2021-10-12 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5f10f3435d478ba25b3f5977ca1a7f36 SHA-1: ba9caf0f83a11774fdf7af554e65e57abd6b0c10 SHA-256: 82fdf613d8dab0da5d06628be4793e836309e98125e43a26e3d3c4e1fd79ec6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ytlcases.com/userfiles/file/79540614346.pdf In PDF document text
    • http://atem.sciara.eu/public/upload/file/bopagudenagutikuwu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/8019508f1dae5071a31ada1923c5cc22/7152881183.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/9303733300.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35173097294.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/jotek.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/tulav.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/zidodeban.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/67906459192.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/borizukubanotawutuvig.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7f3979252---nedefekazuxazixereja.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vimolawuxasemesudutudigin.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/texulunozulewafokibop.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/xosinuzezasidu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42073050014.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/pusixiliwasukibowazak.pdfIn PDF document text
    • http://gains.kmvindia.com/ckfinder/userfiles/files/napewuzotafonerokibubuju.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xomofiverukudiposazida.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/pidomifuvugeludi.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/mefejewewofivozobude.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/buferoduraj.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202110061952004577.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/gapegubafaxufiwasopover.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/34effd1af77562ea422359bf7d7575a5/vibiwexejetitafop.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/HTGXzuRVGb4/uplcv?utm_term=download+ebook+atlantis+the+lost+continent+finally+found+bahasa+indonesiaPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 18892 bytes
SHA-256: 225a1effdd9d126df1f80b4050c69e435146c249fef36af59f0bc0bb7b12a758
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 11008 bytes
SHA-256: ea3b6ed45e5097f21387111922299d72a6b80dbf34d04634096c4683da25f820

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