Malicious PDF — malware analysis report

Static analysis result for SHA-256 b164972893af50fd…

MALICIOUS

PDF

106.7 KB Created: 2021-09-03 04:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d41650046237f72d45ee90e873db858 SHA-1: 6e875993331446ca0d66beaedad49ad34c2ef1d3 SHA-256: b164972893af50fd317eacae48658e263b253122662e698b8ec5f507302530ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718efd1fdd6---kegumufi.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2835a54e7---68098897896.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/pewopizid.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d09a475c3---8290851071.pdfIn PDF document text
    • https://cli-kh.com/uploads//files/202108122148184942.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/rawaz.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/notuvipanikiseve.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/napufiwoxobetuwik.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/60136155181.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/56011741712.pdfIn PDF document text
    • http://tele-video.ru/upload/files/nawesi.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/ferove.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/34704182072.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a206d63f---tujotisejaz.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/10385803543.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121dd89eb4ed---safofenigojovagumusalo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f37f74ea222---pukukileniviwuvajifer.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/gikozubasig.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/88914161639.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2eacd9cb---nosigiwaw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b096e9041a0---magevuziti.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/20325190614.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021652221366500.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a0dca1616---38565661716.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2%5E2+factorial+design+example+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001387c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15093 11140 bytes
SHA-256: 3b977a084027da22c62f99216523dc1625eadacd7d75a53a0a4109e5dd8e923f
font_02_sfnt_off00016a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A75 19072 bytes
SHA-256: f1bff4b8097c92abce51842dfdd0cb04067d0a1f566155b7acc7e31a2b411fd7

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