Malicious PDF — malware analysis report

Static analysis result for SHA-256 691a9f8e0d83c424…

MALICIOUS

PDF

81.1 KB Created: 2021-06-12 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d63b79a2e373b0403a05257bac9ce61b SHA-1: bac1ddbab044527bb7b60e7fc498c40bbaefd041 SHA-256: 691a9f8e0d83c424d02f5ac93f25c2b91c94d3503e72ac2e1aeda6445f6b6872
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a lure related to 'Zepeto unlimited coins and gems' and numerous links to external websites, many hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://nomylo.ru/uplcv?utm_term=zepeto+unlimited+coins+and+gems PDF link annotation
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n1g8r48r9gpp3tjogipda24csq/fidamatogexotuvubanoru.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/37472889102.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/biwukatuwetofewoler.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89f283d66---24867632944.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/subitokovedif.pdfIn PDF document text
    • https://werbemittelag.chupload/file/99840993206.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ep11t2a04ie9htq41i1u130q9f/29178944319.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/29675266632.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/punodetubefusirejedagodep.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134bd4befc---66165041827.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f682ec4878---71683119754.pdfIn PDF document text
    • https://penal-garazh.ru/files/vutojagijorelub.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f63c7fd0---1659481757.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/vazagagubumuxevo.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 5256 bytes
SHA-256: 96a9e39fa19ad99d138b5d13bd7e24ca496fa89f3939e73f88dc121d7c83ad10
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 11032 bytes
SHA-256: 0f489b0257bddac7a7e5a6a4771e1932172b5550933135bf402b871951a424b5
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16900 bytes
SHA-256: a345866da81a06dfea3f195d4bad432e6ca6a3c2589e4d1b028b3ef52cdf55ea