Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8c335fe47d2434…

MALICIOUS

PDF

112.3 KB Created: 2021-09-01 16:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d4bb68534bb97d073922e9f74e1f754 SHA-1: 92f4a80c54b227158c5e9b8654e3fb1166d35f11 SHA-256: ab8c335fe47d243492c2d34933360f7fe61c897938ada9e4907af0caf8b66c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://goldstecq.com/userfiles/file/netil.pdf In PDF document text
    • https://osakadentalcare.com/contents/files/52748172379.pdfIn PDF document text
    • http://candientushinko.com/images/file/41498196161.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/kaxina.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afd15d838aa15669104e838928e71ef1/javebera.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607188531a858---42169488169.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/piditanadifibuxopax.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/28563669354.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/85983735604.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1b82277f---37919722895.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85d9047d8---jevodidefov.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a38f9f18c---lamupizitopifizuva.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0d4c180048af0b5a74b33d69c6ad988c/62077769614.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/bidaratebidukanore.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0c9a67e42ebe530ce295439dcda359f2/jeruxa.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/xifafutusikav.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/82833752059.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071401708851---86288268511.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/kuxafitizolopovito.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ljca64pfollf3913mlcmnmpt80/22620691218.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c4e161ae---tuzikofasutajopomo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4686d5181---vadaxasagiroba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=breath+of+god+in+the+biblePDF 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_off00015018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15018 19872 bytes
SHA-256: 113e2b536156beeb6207212d6f28474b2b568caebe9d99e1ebfe8c77ba0aebbd
font_01_sfnt_off00018244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18244 10660 bytes
SHA-256: 631b409d7ac4921b3fc0d47c5724aab1408602a6666ce62a8e50c33a02d943e5
font_02_sfnt_off00019a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1