Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb9133f6eb554df…

MALICIOUS

PDF

93.0 KB Created: 2021-08-06 14:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b83e1b25ad582b8522fd3a1028c2c8c SHA-1: 516859780d952f5c40a8160eb6ad80a7a8a96756 SHA-256: 1cb9133f6eb554df96a22c80a3c1faf0feb31b1dc00ec5e284a2f4a15dc85dd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous URLs pointing to PDF files hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting suggests an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://coretry.ru/uplcv?utm_term=unit+circle+practice+problems+pdf PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784aa459bfb---71353879790.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/dexuranukuvigoko.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7bk96c5iae8rjoesv3rkevn7kq/39918157931.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073bae277b61---rikaxazunirinuzodunopubo.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/16670885425.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/wutezekegusezudapunopogo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f23495c45---11385644527.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098392678e3f---5215060231.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/59318ff7470c14fa1c067c571a09a22f/62321441821.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/36f3a32581249cf739ae20d031a281b7/zovinemububu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1fae1395---pozasozuk.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0ainpbnkga77cosvvubukhp9ea/benitawuvakifopope.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/16807679154.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6b0f3a9d48d9329707fc74c80d337b43/68028261281.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778da816b5c---39239350718.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vepagupugikivurawo.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/33809231004.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/47a65bd841cd48168816c3d7d3b956fa/93319299966.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/nixefuxegazup.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/72962559738.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/podezidopuvaduta.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/ceca8e6a0f3c4c4b7b0fa7095cf45fec/nuligulixula.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/wafofopalovitebiwus.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/51105f9af69dab347005128b45b6b367/95598125560.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0175269c84---51815593295.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_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10928 bytes
SHA-256: 01edde9b47d914ac0baa829aa1b666282bd514c13cd59a0fbee8bd1034f03576
font_01_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 19124 bytes
SHA-256: b68bbdb7131ac2aaacf005b6adca291e3273279a975a006609bd1c6f2e5d6bd2
font_02_sfnt_off00014dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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