Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdfa050eb7fbfeb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 20:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 81153e940f81b26f3487cf2fad234b41 SHA-1: e0c1ffe4fe7895e450bffb49765ba583b3873a39 SHA-256: cbdfa050eb7fbfeba6726d6eea9e6a8ffa1df55f96786e2fa606a7ac151c36c4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://yuli-china.ru/d/files/86959142786.pdf In PDF document text
    • https://035620126.tw/upload/greenkitchen/files/gusojisutu.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fgsao8bd7meqd3tl6jd2jkh0df/75470784489.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52c892e762f17b160345260acbc7a662/gigugade.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/4fae9940e05f022b4a32b0b89101e759/mijonunojorad.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/54860142318.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/sasupuxamuzigigulu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/23398921506.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/lobupaditimujiferaw.pdfIn PDF document text
    • http://thegioioto.store/upload/files/sewemanakukaxodurufi.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/39186255183.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302aeb41629---gaxopam.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/nafogajirez.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/22818856018.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/88241475496.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/juzulus.pdfIn PDF document text
    • http://linza-market.ru/upload/files/mepobaragenir.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/70683733357.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/bariwarapo.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/83950303680.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/1669478314.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/mafoxok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=picsart+for+windows+7+free+downloadPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 17296 bytes
SHA-256: b551471d3ef2a42828754d7f8fa276c33ff026b8c568bd6410ace52c28f8c938
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 10604 bytes
SHA-256: 7df113f570e3d78052f194596b621a79bcf569a0110fd5c8a95fed1d3702d8a6