Malicious PDF — malware analysis report

Static analysis result for SHA-256 9257b299769bcc16…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 04:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5688782b7aeea0c03b0eb51b60209c12 SHA-1: 2009201f3bc0aeb6120181e80db19909cc974c28 SHA-256: 9257b299769bcc167d920ed43fd87efb72cc79cb0957880d1caa9790a27ed5ee
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, indicating an attempt to distribute malicious content. The presence of multiple links on disposable hosting and the ML classifier's high confidence score suggest a phishing or malware distribution scheme. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k1l946i37hp9fkjnu0fdb7i0um/64843852572.pdf In PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161300ba139495---54217849620.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d38645dfa3---39957057752.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/92317202321.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/32666400675.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/kp05j9en7duqsvroc7gc87fkfn/24132298948.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/3815983066.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/buzesonujefikegudapufol.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/kimobaxadezo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bajiwupewipusi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/82593733330.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e82a8fbaabdbe96b2cad6fb71036863/wowavu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137d3372d607---naponubekavuxarivuxomid.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/wamitanukitaponivonivox.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79522803415.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/65384400908.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/lakopuwuge.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/87666543653.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/71487975394.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/70104645298.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/nobuxelaxi.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/mewunafad.pdfIn PDF document text
    • http://vpsystem.com/files/fck/sigaped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=free+psn+code+giveaways+sitesPDF 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_off0000cea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 10888 bytes
SHA-256: 3e7e2e5188414529ccaba23520f9a228d583a3513ad2d65b9c98a133bae6334d
font_02_sfnt_off0000ffe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 18084 bytes
SHA-256: 309baf6ec49fd7013331ff202a26c600fcc5519a98fe7940cccfef973120f790

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