Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f203fb2af711f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 02:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a883cc33720e4b25c851fc26649d9c4 SHA-1: 5349044e0d06e2ca0867ecd9e7b9f889f514a944 SHA-256: d37f203fb2af711fc001a0c2bd6c8fc1d7ddbea71a887241217a26aa8c7d28dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://huntland.hu/upload/file/xumixaxov.pdf In PDF document text
    • https://ozsersogutma.com/upload/files/vomijovojadexa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb9ecb3fb---54846798589.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c5e1c440---77570474625.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/wetujevedagewejewifemex.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/55444475772.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/47591193439.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/856870166263e922e4428fa782ebec53/29630211124.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/turalewularidutusi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/4334186516.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f34912483---xalikozit.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/60597353935.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609201bbbeded---kixubapogemewepeboxomi.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7cp26d7f5li3ckfqhbcf86gs22/xawitifobaf.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd293b92f40---sijikofagivi.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/42268912472.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zumamanubonato.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/jofaba.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/puzemadevikelesesobi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ab28f0268724afbfbe06792e9ae95b3c/jekewixinemu.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/jegolowelitalamamutoje.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qlfr89d2nmk6jbf4v8v1i9hppl/pojuwupalado.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/xuten.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cdd488f10---227532926.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/vuxowiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+happens+in+the+light+independent+reactionPDF 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_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 18476 bytes
SHA-256: ee597597b6bccdbca538a4be7ced40da878190034037ba7c560a33dfc4c92c29
font_01_sfnt_off000112c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADF 10784 bytes
SHA-256: b2b038aad5fdfdb651ea58d2143c1291ca02e2bf8084ea047dd6113034699cfe

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