Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd6ef525a6bf5374…

MALICIOUS

PDF

88.4 KB Created: 2021-09-16 04:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 772e5d2fa64e1fc7c400b65dede39be0 SHA-1: f65eb920c36e3fef0ac61fb868baf95f618f437f SHA-256: dd6ef525a6bf5374e4eb8378cf0ee047962f19f3a3e053983663fc11c7f13804
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript could be used to further obfuscate the malicious links or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medianet2000.net/amm_prod/image_news_popup/file/19745677443.pdf In PDF document text
    • http://lawfirm.vn/MINH/user_files/file/bujufa.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72755086448.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbde014bb8---bomugosulumazuwakimolut.pdfIn PDF document text
    • https://tcremich.lu/files/files/70383435499.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/27411263907.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/foduselegadobabivu.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/68176662188.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/kegoriniji.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k0d5hm2mv7rof4b1lbiam99t62/xulaxozirew.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/pekub.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/9544953223.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/16/file/bukolilajuxubakokifi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/doxikapixixipuxamefe.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/74851079984.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/retisigeduj.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuxip.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/dutobujezoxoj.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/futenag.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/13911609316.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16139de95a713e---91875182599.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/19447002331.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad3dde14---89416970879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+best+android+repair+appPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/tebetasurenalopalunojap.pdfIn PDF document text
    • 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_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 17888 bytes
SHA-256: 2c7c74fc778cc19e8e95f1a54244de1a8a8aa266724424f2e7b9813c5ed83d22
font_01_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 10576 bytes
SHA-256: e2f5ef9a6abbc65a8e2c87be96daf65f79328d0257b58e72340135e0eabc9a6d
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1