Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93c4f8c093a9c8e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 09:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1f0a9ff2eef6efa237b88520ee9fdaa2 SHA-1: d61db0b2a14c67729dc2ee605140e1dc6e918077 SHA-256: d93c4f8c093a9c8ef462488d5e62e1ad102469f90d13d685360ebea216efd879
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 0.9974

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://chcial.ru/uplcv?utm_term=how+to+reduce+pdf+file+using+adobe+reader PDF link annotation
    • http://novosib-sport.ru/ckfinder/userfiles/files/bapupebobanavezivov.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/vufajebobijeremifa.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tabekuda.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/nixirisumudenejujok.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/paganomuwotemesino.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v617v5p28g90rc33m5rnurthf2/30453034805.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/xosalekewuguwotufanof.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/11551099574.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/nuluxigenidilej.pdfIn PDF document text
    • http://bienbao.org/uploads/files/46532205828.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f99d2aee4---36159149789.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbb298db19043d45548b7bb1e494a47c/pibezawegarimazunufemakib.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608218dc13572---34748968877.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/mizokij.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/cc8e127ff96259762690209a8e5e2465/20266083733.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/39551880253.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/26092051628.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/lawunukov.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/naxafulurupuneka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082762f4681c---19993926137.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/16923627774.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/68002190077.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/34952857212.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/udpcjqeu1lrlfejhp174maqgsq/koxetiniwi.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_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 17748 bytes
SHA-256: c088da68cdbfc697329cf23a3c694058c68f815b44dff281a778eb2a38fa5492
font_01_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 11112 bytes
SHA-256: e6b695bad2253d8a9dd98c062fff0c77575ee1e526f4547adf5d254885b49973
font_02_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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