Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e17be79b5be5433…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 05:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5f77bd9a4eb79553c9943aa8bdd1df36 SHA-1: 1025b96a18598ab8dea344cdffc31c95e36507df SHA-256: 6e17be79b5be543331b18f49ad6c1e08eb7d02e6eea5e5eeb0ba39dfd48f4f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is part of a link farm designed to evade detection and redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=steven+erikson+gardens+of+the+moon+pdf PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76aecff88---firat.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125dcfaac48f---nisutapu.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/butafovete.pdfIn PDF document text
    • http://apcmagon.com/userfiles/teroxuwukugad.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gimavezo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/muzuxobumadu.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/ralajofirataku.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/5944908939.pdfIn PDF document text
    • http://dnepropress.net/files/file/ruxebilexuwu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/legaz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160839b9e138a7---9241515810.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec75f10462---82613309401.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/8455846452.pdfIn PDF document text
    • http://deauville.ru/files/file/75433287666.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608383205202c---gozobutebadamudel.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc9978cdc---rexopol.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/vc10e3e9uuejvjdecea0ktird3/34847115275.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/34938891382.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/jibisutakabolox.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/tetuzerugodirikisane.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/sokefotepuvibenuzi.pdfIn PDF document text
    • http://come2menorca.com/images/file/xagaxaragekuri.pdfIn PDF document text
    • http://altus.pl/userfiles/file/38105956529.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/1451328880.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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 17220 bytes
SHA-256: 896c685e9404e292eba649e1f0f76c7b35f25a94d506ffb463aa1ae7aa026a9b
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 11132 bytes
SHA-256: 5de1e607e508469de81243d28cc6dd3aa4ffd2641f581b0e68b82beef94220cd

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