Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75a27eb66774038…

MALICIOUS

PDF

92.1 KB Created: 2021-08-09 18:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7b52487cf8cf5365a9bd630acf3929c SHA-1: 6f6b17334acf341dc99e22e4b76cb6096ee376ec SHA-256: d75a27eb667740389e00113fcdea68e43e2f6dfc96476e6bd0c4940af1177ceb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://upoart.com/ckfinder/userfiles/files/44828763079.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a672f1cc496---42911575802.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/97973764548.pdfIn PDF document text
    • http://sb-78.ru/files/file/6687278592.pdfIn PDF document text
    • https://majubesar.info/contents//files/90842644321.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/05a75dee05f132da222e2c0f204f7c7d/rovoxiv.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/14493563823.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/komasabeboleg.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/31833173735.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/robitepimorujosekiwite.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857ad78c722---maruratekujaxosagilew.pdfIn PDF document text
    • https://mszukam.pl/dat//file/77503094728.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607179107bca6---nutuxoxefepori.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/lumatavev.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/silepijidewilibunize.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/18991629965.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b772bc82c8---jiwimadub.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607033d6362af---69198126596.pdfIn PDF document text
    • https://angkalaris.com/contents//files/nafixegoto.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/27105741858.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/puvabedibi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e521150be584a57efa257fe34306dbf9/58202635829.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939c1765150---zufuxutobopixeb.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/menadufadupetujolekupopuj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070706bd9d93---15407328482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=maravilloso+desastre+libro+3+pdf+gratisPDF 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_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 18764 bytes
SHA-256: f6ce167214d47115c4e5ef945751efb9cde189fe764f2e8b9ec9f4fc31296544
font_02_sfnt_off000146b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B6 10940 bytes
SHA-256: 4c5151d8fb766c1c054b13739ef4209c732ba5b3c99f892075b95ac0f3b8ddbc

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