Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0387cd1354a12f…

MALICIOUS

PDF

79.0 KB Created: 2021-06-13 23:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8e11e44a12c604a134f5ea7c10fdf86b SHA-1: 659b2da5e2713d8f2e292c14c0299c3759049c2f SHA-256: 9a0387cd1354a12f81979974c237d6eb3f9c6a26f24496ba501745820e41eb33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using link farms for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://wastran.ru/uplcv?utm_term=data+structures+through+c+in+depth+book+pdf PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/majmj1q6itomgffr797eas4kdm/madewijinigusopuxo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/b9hnujau8jufoc079vek7pcqm3/xojanufedele.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece0ee67ef---bifofofav.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/4dhkmm4k63811csbtb1f3gutm2/tofaruwemajigamomi.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e9ad0b8a4---88212406609.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/96691252372.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/70cgm3cd3rfq74vh5l1qh3rqol/20112646184.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/dizezopuw.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9dfcbcb39---dubawaserag.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90811610f---tetiwewamevefag.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ccbed4960---keputupapused.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/80993553533.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/72q6kqv6p1mdi8odcsgg9qhs70/47803144878.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fffcc4fb50a42c1b1eaec3815f032753/pukiregixedesuwumuk.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c3d8965ec3ff932870379877c3b566cc/95310404556.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/31967066822.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/toketegezenifa.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/69813941945.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 5588 bytes
SHA-256: e035afd656f8068a75d529e86f17087dc95442b5a98b30ec3bb45eeb87777269
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10804 bytes
SHA-256: 490e112227bece544745cddd41ea3b54061daf1d275173de04569c98c86794fe
font_02_sfnt_off00011966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 16164 bytes
SHA-256: ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1

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