Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d19d93e1443338…

MALICIOUS

PDF

313.1 KB Created: 2021-07-03 15:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de45691cdc5600d6b2ae7a87f112cecb SHA-1: 2da5da2cafc2b421e9d97ef16432dfa560211082 SHA-256: c4d19d93e1443338f549ab1974543bf6c372c6387ef29ba3595a47460fe3bef5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the links are likely used for SEO-based phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8628

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://resetimpianti.it/reset/public/file/xusitoxapi.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/18c68bbbbf9635f9c38be6687c85d2ed/69404756507.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a59ad5ad6a---lipetamegizututadobebe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/395tbgph385av9uqht3qkqjqk4/41241542940.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/94ee9918735aca095a13ef7d2157ec3f/lorokixusu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/divijagevusu.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/papawaxa.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/d7dr8gckr8qnnmvqvqnqnhob2u/sofefan.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/72102924136.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/43684727109.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0190e59df---11217188243.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160876ec122178---rinirodajatisopatul.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7gsra7a15k62pu7kbgb70fg626/pozifaje.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a305a544---23226647018.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///79005388952.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a70a6096be---puluxiluvudenowidagowumog.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a64effe8b2d---3842600670.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160caabaf5e825---38309673767.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/20224525579.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6e8c157e---furawerufubipu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/a5619e31c80464cf17e8e96f6a7335a6/40185355479.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce204e285456737e589dd440c1011826/35502149239.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8f4389c72a09478a5b001258a0edcd82/36626376397.pdfIn PDF document text
    • http://poorclarescork.ie/images/ziverisurijoderejezo.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/56443830824.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kemavesiwu.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/30044859382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=woman+sticking+tongue+out+flirtingPDF 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_off0004780d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4780D 16484 bytes
SHA-256: 6f476dd4cde8eaf89fe77446d13185bcfda98d7628656b4ecc25714b2d2e3a25
font_01_sfnt_off0004a28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A28B 10864 bytes
SHA-256: 495c90b2ae871281ee5608964a6006ae1b9c6df6b9665984b944549e0d550a3d
font_02_sfnt_off0004bbb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1