Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4b80a5096a042b…

MALICIOUS

PDF

84.9 KB Created: 2021-07-03 01:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a8a8f6714f3c5b32a70b9baa4edf2f60 SHA-1: b82d2fa773324705ebf5148619f3fc068686574a SHA-256: 3b4b80a5096a042b28d4c3150bc101d8cec6ea836e1d9bc808cf5a2ba499d012
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. It contains a link farm pointing to multiple disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links on potentially compromised CMS upload directories further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ndt-tl.ru/upload/file/bisuzavula.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/regevipezapowovosumarefim.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f76531868---94117640964.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/612e7ae5fdfb7b6e1f0447e105fcbf74/bulinaditowukalag.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707e8dcf494---zosipesekoku.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a9ee4e2a52b6d716eb5784b2c3dce424/84008143514.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/98872940094.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2327f236ce420dcb48797cfb29ec155b/kelujapamedakum.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609840f9861e1---34670406742.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/sojofisagebogovidoxuta.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/101f517d346783455b957df7ec330059/76216710766.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/cmg0f2nfc008d4jhiduss50l1u/37056892138.pdfIn PDF document text
    • http://centronegozi.com/public/84583494273.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/242003254860.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/5fhqdqstml2b380hf446dubc05/96135852352.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/melobodejufurige.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/gefevizoneginebumek.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/dokipogisoviroz.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/49623024222.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160738645c6d99---12056835347.pdfIn PDF document text
    • http://firegallery.ru/img/upload/nijore.pdfIn PDF document text
    • https://rajaunited.com/contents//files/fuwalu.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zezunomajixaxuna.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb308f523---dutirifewaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biblical+meaning+of+fortyPDF 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_off0000e94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94F 16800 bytes
SHA-256: 383b186b64b5469d806be190748fef1b854d5557736919cc2ffe1562559ca69d
font_01_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 10816 bytes
SHA-256: 19728b96acfdcca1348793faef930a2a0f186ea6041961d50d220fadaa6af153
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1