Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ffda95ab11e1b2…

MALICIOUS

PDF

104.6 KB Created: 2021-09-04 16:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9b26e26dfb3d092f14974b00ac5c653 SHA-1: fdf16d0bc1a7d446174a5463fcf715bcfb0f559d SHA-256: 56ffda95ab11e1b2259c591a678b401096ad667aadf716871e46f0bc95d93e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. Although no executable scripts were extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f2cdb3d9---xojudazi.pdf In PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160814ea625e01---53739019590.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/673daip5m67uvhemp3tgbjqbi5/nelogofide.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/nufesenuzarapat.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/7156231957.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/0f08b95e5a81ff11c67a22dd731da06a/lumekozexometu.pdfIn PDF document text
    • http://gysanya.com/upload/file/210823184643911722tsvkncpssw7i.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b469a9b0bb6---jenorarudexobukarafasopoj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f559b403b72595757dcb380fd83541f9/37615975417.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/pexaxosalurujaxute.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/sewoj.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/92328296813.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/52908516703.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d522680c12---linowaruwegawikinu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b726263e7f1---47983456563.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08d41c67215b49cf84b9401dcb0137e9/15502250560.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbee47976---xebomaxafosidizakugusok.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/furuzulok.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097d367a0dcb---77525185478.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/jugop.pdfIn PDF document text
    • http://short-story.ru/upload/file/86268038096.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/jigabasesofib.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cead0a0ef---27007523908.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/30d575df9b21508f88c0971a0d77df9d/lomonimujevinodilulaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+birth+of+capitalism+a+21st+century+perspective+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_off000130c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 11440 bytes
SHA-256: 80c04de05ac4a0236c78440ef4fefb6219b6954a361f0cdf85f38d869b8b1204
font_01_sfnt_off00014b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B83 18680 bytes
SHA-256: 34ac78e14ef74735ac05c368fadb84b2d1b388d2f106af46099cd13ce0cd3828
font_02_sfnt_off00017bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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