Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d28f59f65df479…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 08:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c8f1fca2e363e3622799113b508d2ae SHA-1: 837aa3740f477f9b5dd5acc7e6ac0ddb9086e294 SHA-256: 17d28f59f65df47981612fb2eb9ec1e9dc85b8cef241f35cc0e464b6150bc6d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or utilize link farms. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://drafthe.ru/uplcv?utm_term=engineering+graphics+pi+varghese+pdf PDF link annotation
    • http://fnathservices.com/upload/file/79279483170.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/14432094678.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e341761100433bff304f270ecf16fec3/tenimu.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833e590a914---84526135790.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/khnho5pcqf48rafhlptou84fas/44918726425.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/womedakegidotofigakavitus.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076e7be49585---14487587168.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/60776454409.pdfIn PDF document text
    • http://honghuibio.com/d/files/71823688904.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16121e94279cc5---jepuvaxujofojar.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fa244e23---34179426468.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/1f68541ffbc4a040db58225072c7b567/79074472528.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/6755540211.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd07e34d5---23089869423.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e224706b8---15025548293.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fee62cebccd---91599769209.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wuxexonek.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xibinuvizosiwepajidojusa.pdfIn PDF document text
    • https://htchninc.com/d/files/jevaxefamobutobe.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/42547712017.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/16760657156.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/55280533667.pdfIn PDF document text
    • https://angkalaris.com/contents//files/lolaxozafivowedijife.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_off0000c5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CC 10684 bytes
SHA-256: 2b17968e1183bcc8f310b11d2bfa32ab313ae8396b74f2dc4f59257d87a394ef
font_01_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 18116 bytes
SHA-256: 7ed57657d46e0ceea7c0d3536a4c111c39c47e280298a96b49c1e81d87093d63
font_02_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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