Malicious PDF — malware analysis report

Static analysis result for SHA-256 982f2b6918251495…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 17:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 696165f6de734d1f2b139139ec7c0afc SHA-1: 1de7ac0bf9b01d912879887f247294388752cd70 SHA-256: 982f2b691825149550c340c23ce33d970dbc466d859863caecca892cfbfd28f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content, likely leveraging embedded JavaScript or exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://dalnoboy.com/data/filestorage/upload/files/86706664049.pdf In PDF document text
    • http://m2m2design.com/userfiles/kutilelolaxuvozon.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/18498061917.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/75416370851.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/nabubifokutiba.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/8292647565.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/tikidixazuxoxewadub.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021981447137802.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/31430126505.pdfIn PDF document text
    • https://adikketiga.com/contents/files/40444433730.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/poziwipuvedufutevoneji.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/29903045108.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/82858664658.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210901123354.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613873c1dbc7d---22271163423.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/6781258181.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/jowuxuwuvu.pdfIn PDF document text
    • http://lex.tj/img/file/dikujuj.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/39237073414.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/pegodadilobafidafuz.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sd4g82o02k72ftoponr713mfvc/lorolodiv.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/39233605400.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/87447149126.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/85638809341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=serp+checker+toolPDF 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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17420 bytes
SHA-256: 1e4c2b7d46dcc9a1b864639c590d3766a256f7e6207f1694ae98870d2be766f8
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10112 bytes
SHA-256: 461c80a237cbf94f15b355f78625f5a28f62a9f611f07bb118b2e92ed28e37af

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