Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3eb99b19e5cc32…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 11:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ef5cdf15120179fe3d7ce5a874a9ed1 SHA-1: 8431ae14903b5994f9ebef7b0c739defbd3a81ee SHA-256: 3c3eb99b19e5cc327e72e007e7e402ad95bd46ca9c5579c545d9f573c6ddf4ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://zatoodesign.com/userfiles/files/kuxuxufuz.pdf In PDF document text
    • http://sor1310.com/userfiles/file/93556414678.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/fusepajuxu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/43722799020.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/89913277370.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/papopesapavaguluwof.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4784a111ed3f3bd74f05440598a22a5d/17803782170.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/93588282422.pdfIn PDF document text
    • http://freetds.net/userfiles/file/23034581690.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/24857983926.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wagotekarunos.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16150836d34456---6981485735.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/56045006057.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a61p5ge2u9s4v0bqaphps9lr43/51366869912.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/44393147684.pdfIn PDF document text
    • http://rsentco.com/upload/file/42672482293.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a3b180562---54203096751.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131720018875---wisasajamani.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161310ec02e162---govemakosivatu.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/83291447533.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16145500ddc7a1---51620198516.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109242352375998.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/pulufekarinumitit.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/15346506826.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/fetipadimufojamugine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=front+office+receptionistPDF 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_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 18620 bytes
SHA-256: 90f422170c4cdbef75793fb4a47bbef7c6712ad0df2a687c3acfa294639c9742
font_01_sfnt_off00011116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11116 10240 bytes
SHA-256: c7d4c83170295fbc84d27d14d9b3aad59684bd78f92d8c09b3a028800bb3e605
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1