Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3ae92a6e03606b…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 23:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b7b40fc1ebcf7d84d2a76bcbf339df31 SHA-1: e04daaba70f96e654dc93cf5766c98c0d89b24e1 SHA-256: ad3ae92a6e03606b28e6ad6c770f44069287cb9e7c711c9e6d7ecc5e362ab21b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as confirmed by ClamAV and ML classification. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution campaign. The PDF's structure and embedded links indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=introduction+to+energy+worksheet+answer+key PDF link annotation
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rmh365k0v5d6rcb1ihhar689ak/21966774190.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/63612806734.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a05efd2d4cc---90276055816.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/golamedarexusobadevuf.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/45157070566.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/tojalopebavodeguwijigir.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/33865806254.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c314a1fcde0cbddf19236115608a3acd/32582854306.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/60659172710.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/54350208174.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca81171de3---rokujimepiraturen.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607287fdc1340---16797702194.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096dd81cafc5---11186006453.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/voxilebonemepojudu.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/34829102594.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zalufikitaguvivef.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8e6df809ca5aade596efd67d67e1eece/wevodefi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f90c6c77f169bab3183f4056696bccfc/gufiluvafupijokiwez.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/63637124465.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/fugezupesu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a300547eef2---98632800373.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e27f55fd1e---80273436709.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f004a8ebd5---gukikotitinij.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/n18q8n9lbpki37eb5cehgibdgg/rebapoweloji.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/p38ntvmurdoou0d535hao2do64/36961242450.pdfIn 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://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_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10944 bytes
SHA-256: ada2f3ad266984eb9e9c466638d0da40f3f4eda3aa25aaedf7c3250ea27d92ee
font_01_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 17660 bytes
SHA-256: b257c0939d25387e573288b9fa2aa6211dbeea5c61b760152104e51017f17e9e