Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae39cd9444410e1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 05:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 64dc1a647182e5f8f742e7d39eedf1b4 SHA-1: f814e8d2fdfc2dde1b291be980cbfde1b71ac57c SHA-256: 6ae39cd9444410e1582b99f21b31e887c4ae7e7198ec7c0928965da86a324f8d
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 0.9981

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086995f35435---78682571895.pdf In PDF document text
    • https://ibrahimkoc.com/images/Media/files/xawawepufidekiporu.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/51262993392.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/noxomutezutabexuwela.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f18aa20caa9f3b08fdc9092446cb0779/60145389152.pdfIn PDF document text
    • http://elitvorota.ru/f/file/83097907234.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/79b582fbe895e9eec26f3c1d80bf968b/53126637407.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/93202907579.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lofikagelatobife.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/dajogigibumigevazuzujep.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16116c57041f7a---50130120406.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160966124442ca---60602195026.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b924ebdc84945c5ea0496f2bfdb0dd3a/fababirugi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611ac0b8be14f---57472876886.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56b2e903d---rinaseren.pdfIn PDF document text
    • http://abc-tel.ru/data/File/rupejadogiredupojinitewu.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/venegosumalotexi.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/6cc1ea49da942ebcb7ddf608cdbc291c/jomupawusawawasadelojeli.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/63289109465.pdfIn PDF document text
    • https://senhewood.com/d/files/6648568101.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/176190f7b35edb66a8fc275500fc6af8/33825902625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=suzuki+grand+vitara+2007+workshop+manual+free+downloadPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/27364144979.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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 11716 bytes
SHA-256: ec276603ede4b0b81ec97400a5e647b674c46167f2320abbac24ed1c4e6ef6dd
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 17148 bytes
SHA-256: c8e38cadcb19a32c3b61c0ec41449f3dcbfd437dfd5c5f7ca304d3180fb5d9a2
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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