Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7fc918eabb0fe6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 09:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7c19b7269881b0aef0b2910d83effd95 SHA-1: 80454b531e2142dbee7ba9f35a31b13cf231f050 SHA-256: 7d7fc918eabb0fe60d20679f04f8c21397f0026dae0aa80c68aaf2ccfd16020a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple external URIs and the use of compromised CMS upload storage are key indicators of this attack pattern.

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c50c63d2146---70782179701.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/5ga2ebv9j58ejb1ktepiheceh6/61543504430.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104d547edbca---zorumevegexo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fujaxumulijefilij.pdfIn PDF document text
    • https://gilbertems.com/videos/file/67740331373.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d683045dfd---47268324461.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pofaxidirazo.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/bodinona.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/wurisaperejekapikij.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/tutabudoximokibimopepol.pdfIn PDF document text
    • https://phuquiland.com/upload/files/tafenokoxegejavu.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/lolijupiwo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i7vek578kmp8cgj2a00agaokvq/dujiminoxutetezujadu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16118963c202c6---63756366906.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/gutukizubedobiw.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/28775080106.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085acd50b322---45268893099.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/gg40mrc4cif9nmll98pgjt7aq2/13876845743.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/bc00c4442b1d9ae2ae5ef7b9f34be500/dowile.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de8282c04a2---71960274764.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/7bff1631f816c4243e752a2c46a4966c/lixozujalup.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fexufipagibapoxevugovolaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=antioxidant+drugs+pdfPDF 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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 10680 bytes
SHA-256: ba197b6d7828c0339af83adb62fba10689ca44ea67bbe4e89393956fb697b607
font_01_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 15464 bytes
SHA-256: 8de46600cd96a7681ec6f5dae66ea9d7b3977f8b744c35c6474f538a216db3f4
font_02_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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