Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdd73f8048b82dc…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 22:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c2fef139e1d12244369db9db3cd55dc SHA-1: 4d88f8f81221b163289a6b15c281963a24bedbaa SHA-256: ecdd73f8048b82dcf37a994fff9b207f8145bb1dc80e13e1ad7715683efd63b8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further exploitation. The presence of compromised CMS upload links suggests a pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://wo-kop.pl/userfiles/file/59211524480.pdf In PDF document text
    • http://autobedrijvenindex.nl/images/uploads/22227884923.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c0144319---fugobaxen.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/16863131894.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/zagoxakebulavomaregobupo.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/78468010917.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608964722fdc4---kujufuva.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/35623048731.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/im56da8mq56nltmjnlip7grpk7/32373485651.pdfIn PDF document text
    • http://fairview66.org/clients/866114/File/60234913132.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fca4a642e61cfbb1839267fdcfe5b8d1/37375066673.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/16595203548.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/20542317681.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/fipemavaxanorodem.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/9479052263.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e7203dc02c42b1071945bebce29f273b/gebepaxalewigas.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/vubupuzi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/t60a6onuet4sj26m1ff2jtkk1v/dufeforaramuvunobedusabol.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960faa5ca92---mebanojirikogi.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161093232b1d4a---32708649713.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32567b829---14209875972.pdfIn PDF document text
    • https://amblamy.ee/upload/file/purumesapumipuwofarijoba.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/20adbf28f6947f546ba40103abe2fe08/99376737303.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f2672f691---96557506206.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16121a15e4dd24---gilasa.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac46aab6400---xinobezejediti.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/7138894619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=verbs+ending+in+y+worksheetPDF link annotation
    • 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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 17788 bytes
SHA-256: 1f045d75d633d26f78a30ad3c325bbf96b85f62e030eefec784472176f45c57c
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 10720 bytes
SHA-256: 548419a8c66833184f24c52133bf18cc2bf734beb116d5073e6de079a5f83fba
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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