Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af11cc787a94be4…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 10:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7393810a6a243a074ab6ea291b588de5 SHA-1: e6837bd9221360edc1e16b6c21c1520bf47f5530 SHA-256: 2af11cc787a94be4505678d4523b500c8132f369fb49bc3cdb594bd430d93313
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple unknown URLs, many hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a733c748f2---84337276963.pdf In PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/nolisisigilovaga.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/63545302442.pdfIn PDF document text
    • http://koddous.com/userfiles/file/40561129303.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/jozofibuzolojafov.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109250120534870.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61733318841.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/91916183203.pdfIn PDF document text
    • http://classtool.info/upload/files/94536746516.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/50423512235.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/45518984241.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/befuwojugivo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a4da18e84d9115fe0fcbc0f3c0fe7be6/lajugilizut.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lakunuzesuxufizem.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/lixowetaf.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/16e8d92ff993b73c2c497293f11e9cec/tenasu.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rezirimexe.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/mosofudasixojufe.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/lizanef.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/80632543131.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/41510750597.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/repires.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/457594524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+toolkit+for+macPDF 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_off0000b686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB686 10408 bytes
SHA-256: b983e2209d1243daac97e2ba2596f8a42b94a855f95a764f77033e8f4ce78cfe
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 17596 bytes
SHA-256: e4bf32bba1164730840044e80bce695b10091b413a591616c29925c7d78241ca
font_02_sfnt_off0000fb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1