Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3acd7d4f021a15…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 15:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa2424ed39146f364f390f88843fb94c SHA-1: f5825523895d253f2d2303bf0d9998f4bf4b1d4d SHA-256: 3a3acd7d4f021a15da3bd27e5dc6be234e0968c6329a846eab34b68deb525dfc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://infrive.ru/uplcv?utm_term=enter+cheat+codes+gta+5+pc PDF link annotation
    • http://cermak-expo.cz/data/files/file/84663468997.pdfIn PDF document text
    • http://mutitar.com/user_img/files/84011007906.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/51780457717.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/du84ckk7a8fgvc1pm544pn9rsi/fudilijesokowefuji.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/guzowaguwomebawesapuwafuj.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/tenizejanarugavozetasotem.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bcd6d8fd8524b40a0bc799641d3b7ea5/26432697621.pdfIn PDF document text
    • https://value.ae/userfiles/file/7646716562.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/bigolexenojin.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/97448104214.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/87634738999.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/pitokudutab.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/71128135453.pdfIn PDF document text
    • http://attlas.center/userfiles/file/rolupepiru.pdfIn PDF document text
    • http://greenglobepms.com/uploads/97194232338.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/50608252920.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/betipapepemegome.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/21505985917.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143863aed91c---buvotedununokivixivo.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/dujiwufebisopifofebev.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/juvifi.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/63780439313.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143938b48a37---57224192234.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/6176492136.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/bakipigudilawedojugevamuv.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/94605993660.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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD188 16452 bytes
SHA-256: e8009d8a0fa9b353ae0379cde252363fb89467529fcba3ab04e8598066bf044f
font_02_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10772 bytes
SHA-256: 0ceaaca6c7f82c448b27acd33f303377aa8d73029646b704b31d6aa295574bfb

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