Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d8cf347e7f23ba…

MALICIOUS

PDF

85.1 KB Created: 2021-08-01 05:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 47e503a4eb11812bf57fec47a4abbc4f SHA-1: 6ecb53b7a29764e69cbdf0c13600fa9298793795 SHA-256: 21d8cf347e7f23ba606ab4abcbdfa7c71a8c1d5b51ec35a64937f0ecec83b83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=wow+tv+guide+panama+city+beach+fl PDF link annotation
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/de3a4d6f8b57439984c1b6debfc0c674/51677186707.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/gatowatixowukuvew.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/21001803095.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04916efd4a---65439368585.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/893d56edd553895d89507b2ca9af6cbe/riwubisijunifojugijelevub.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/pakikuto.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c2bc24880---gukusanuvogosopo.pdfIn PDF document text
    • https://airshow-bg.com/file/zilizizulolo.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/fosusor.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68a1c9acb---nisadedesemuxa.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d147868422---resafekonozunigurilunipa.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/dizumug.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fuxetebeso.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/jisoxadawuridivexewirogo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1183fa6e1408778f09ab20a20fb8fe7b/38721676419.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/pevilaruwomuside.pdfIn PDF document text
    • http://aimic.com/userfiles/file/bedojiw.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tefevafi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c23e18fe8---vuribuzavejiwebujawoj.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/zixovos.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c779032f0b2---ganifemuvutevivujasevuzo.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/zuwizalitidakixusek.pdfIn PDF document text
    • https://mfdesign.hu/files/file/2689652398.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/5766344553.pdfIn PDF document text
    • https://artbynela.com/uploads/file/17388055933.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/23772260688.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_off0000e66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 11300 bytes
SHA-256: f51a6d0c01651a872c908c07a6bbbe982fc65552819983b77227569043021144
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 17152 bytes
SHA-256: da6e72f2c019f4e610325f5e0d7ef26985668729caf19b241e8aa17ed8aba18b
font_02_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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