Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc4c56e9947c85c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 896b26d9b1bab7254d80fb0447d1e4b4 SHA-1: 38d30618ab9eb426fe2e668529f2cfc9a8721b9f SHA-256: 7fc4c56e9947c85cc483a26b6fbc451a8d538f561672e7c48b536905c52a1dff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=croods+2+full+movie+free+watch PDF link annotation
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9ffe116a56c17ad1e26242a2795880ee/lukekupenatipapuxoxu.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/jalowu.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/vitow.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sejosidewewejuzi.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/27767692468.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/winojomepawozesusid.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/223eu93qmn1931qhjlbn4ehcrv/duxedodijibiworad.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jesebugojododujasop.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/1204947175.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/50657850629.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gosilijokisofokowub.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/luvijapozadorusanibanosa.pdfIn PDF document text
    • http://446888.top/userfiles/file/lofulunoluberujejegilepu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/12565574117.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/90569021661.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c28b92a22bbf821a99df7f2c48cb8ea4/zibomikekivakonedoko.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/zorolulumepalekolutakes.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/tomodufemususeluw.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/milelalatokumu.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/43814038444.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/99722379361.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-23/20210923191959476731.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/mixuxopewalalodamozojiv.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/19874232750.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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 11040 bytes
SHA-256: 16a6b67af2f45f6b43c49bfb7befd80df5666683e61974826cf14b8112cc2175
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 14560 bytes
SHA-256: 47ef80830688c5906f47634205c18a115fcbc6597d19d08528450435bb89f10c

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