Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd0e646fb1f58de…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 01:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3d2ff23b4c3fedb2f657351fe9dcfcb SHA-1: 4708fc8b9a569d1fb234c267ee174dbe082c9516 SHA-256: dcd0e646fb1f58de166c4b4e2b29b8580c1636e9be32fd69cc93ad4d1908451b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://resttour.com/images/userfiles/files/rorujiwiki.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077570382946---48896224919.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/23554573038.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/23106644913.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/23333856557.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/70195064096.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/50149284490.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/sonevafoliwawariw.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210625234547.pdfIn PDF document text
    • https://fultoys.com/userfiles/72532956817.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e94pku0r6dvkp29viso1e3bur5/18532661043.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/fuzaromomi.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/fec78ad02086b2d358e65e1d6f3e37d8/pezugigisojoside.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/vozebotobapasepuvaz.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292089e0ad7---11304727354.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/98750720381.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefa71d7f4---25767805132.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/janenazomejubobefokilo.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/fekelirusolen.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/24a821cfbb1e331ed35c73aed18cdd5e/86509529922.pdfIn PDF document text
    • http://fullx.net/files/tagebakelefumezowuse.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/wovimegalokejobekavedalev.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/4483549219.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/72332006789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=you+are+beautiful+in+god%27s+eyes+quotesPDF 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_off0000d772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 17160 bytes
SHA-256: 83ce2d11faacbec51a5a92755f6807d2a098a249c8aaf6333b85cd730b44c717
font_02_sfnt_off00011bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF7 11048 bytes
SHA-256: 9eeb72bf2125d7a0c8ca5f043e4285daeb860e5128d127c3e00773f2ae92dda4

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