Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b41a2d185f64438…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 01:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b79561d00adbfebe1e8bed6f04d29943 SHA-1: 8fb03bdbbf2879e30e6138247fb09b364c3eb4b2 SHA-256: 0b41a2d185f64438560c58d456cd5437feff5927011de4963ceeabb6f83db4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d26f2957---30304262979.pdf In PDF document text
    • http://sangsangins.com/upload/upload/file/34816634186.pdfIn PDF document text
    • http://rld-carbon.ru/file/tusiwetivo.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/29933657247.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/mazijobujemudasigitaxolax.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/25814642311.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edfbf0eb1d---buzuk.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/50604802886.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///gimuwi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa669b7128---10945939880.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1130329478614477a30033a.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/9221181086.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/wedalopezelodalo.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/88559926409.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/14273413948.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/79839066723.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/998c590294c31254ec9dc89ad8e77993/7709216748.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/65441620151.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/40298768248.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/36819301910.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/xomubinofopakefevezif.pdfIn PDF document text
    • http://metabolit.ru/files/file/44189886143.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/33238296300.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/tesogudodofugakap.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/10056555938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+did+washington+do+as+presidentPDF 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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 16864 bytes
SHA-256: a65ba59fa5362e59b0f02cfc1fc3e394a0132a09ae5838fbcc307fd6d81747e2
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 10704 bytes
SHA-256: 949069cbec45a28299263ab77ac898c665a0a5c6a591dfd0b97d6cf3fbdedcbd

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