Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b29dd9864f8e6b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-30 18:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db4e75a7d2de41658f7a4cb8d748888f SHA-1: c8ed0392648d8b9c892a78703b97d7b7fb0a61b1 SHA-256: c5b29dd9864f8e6ba1abf02e73ea149f24d87e6c26cc7ea11c6e0592ccc5810a
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 WordPress sites or disposable hosting. These elements suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

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 https://philabc.ru/uplcv?utm_term=captive+of+gor+pdf PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca3c20f3f---movelotesaxot.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/1381984037.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/92770529444.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/28554401853.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b48724772---96416480522.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/1657171020.pdfIn PDF document text
    • http://praguetransfer.com/files/file/xofomobibuloponi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/seketotofogiv.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/60106444316.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/xoxazeki.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/60278015126.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/vafemedovanosadosubavibi.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/josidufobizowakoxezepipa.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/zibetuxosawes.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/topewu.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/95805734168.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/83691993494.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/11536689570.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/boxigurulikut.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/ripowubefurezewuwopurojix.pdfIn PDF document text
    • https://12shio1.com/contents/files/18190233891.pdfIn PDF document text
    • https://costarica4d.com/contents/files/96995529437.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161423fc1511a8---79484698714.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/99863674101.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_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 10452 bytes
SHA-256: 3ba80d37fb1924ed2a8fe5139cc1d6fafe0410a3ad86e5bf6dbdeea15bbd3296
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 20020 bytes
SHA-256: 2739726a308be402a27e13f6f3174e3afece1efbed0941579f8f6789a1c067c6
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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