Malicious PDF — malware analysis report

Static analysis result for SHA-256 259a279cc0c54391…

MALICIOUS

PDF

78.0 KB Created: 2021-09-14 15:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c63cff94dee2e2b49b9dfca636b8675 SHA-1: 662781209b43af23b66b67044c72e59162f50d90 SHA-256: 259a279cc0c54391d6ef8e75b38aab7d53d9dc4e47cacc35b60893b493437e05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://njshore.drinkpoint.com/uploads/files/pejusopiruxiwarufezuvuzov.pdf In PDF document text
    • http://synfarm.com/upload/files/tofufato.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/raziridagumen.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613640bf96dd4---rogotuveminixatutukuwo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613df72b22d06---tasoduxofufeku.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/jixowusakojokegowefev.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109010946272390.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/53032633206.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/tigumavixitusalo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lelokidexu.pdfIn PDF document text
    • http://ellev.fr/upload/files/40602607629.pdfIn PDF document text
    • http://reopen911.info/media/file/15093727862.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/4432345860.pdfIn PDF document text
    • http://ge-mak.com/files/kebajo.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090604301318796.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/zibuvikojarobakokomusewel.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jizor.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/jugimom.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/bopikejisifuleseli.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/rereka.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/walopurobedifas.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/zulosukexozawonisovum.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b462fd19f3---66684386411.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/pifetibumanumoxoje.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/zibawoxegomibu.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/febiwubo.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/88487913830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=like+a+giraffe+mod+apkPDF 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_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 18308 bytes
SHA-256: be94da833e2b9e4dd3cf07349a5fbc5580f2bfb67330b2f57822ca25fff15912
font_01_sfnt_off0000fac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 10476 bytes
SHA-256: 86bde329ad090125e91e9c8c5377609fb8e617b5d2e863aba0914ca1070ad353
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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