Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d529a15b7831c2f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 02:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b11e5f01c8849152108fed52d002cfc9 SHA-1: 0366d7edda5fb33fcc6ea6e5d6c35a8582f5b8d6 SHA-256: 1d529a15b7831c2fea0170cfe6917b99dd621b108795a03025a8da1df63b83c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads 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 distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://stradatextiles.com/upload/ckfinder/files/39007624424.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ef092fd000999c1a2c8d02d35a56dc7e/mixixinabemimadesike.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16074c72f012ea---35408048030.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/seronijuji.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/86267625819.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xulebazi.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45d710bf9---ruxeze.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/rezebujaveredimi.pdfIn PDF document text
    • https://manenshop.com/upload/files/47508350102.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce761a4a45---laxebeluvumijimulepoteb.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/panof.pdfIn PDF document text
    • https://autoskola-scp.com/files/82511978632.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711384e5b12---sarefawuvekitudatefolute.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/rq9o9adlauten6trv97o4tsa70/85361234349.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d6bb4cf5f77c397d9f89275cce72fdfe/49201880889.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/882dc96d64f3e9205cdaf64d5d1042e4/86965378575.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95270773782.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f1e780b6f5d70e67ff3ae6228b2f5a09/68464166342.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/bibawenunidofupa.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/10749067283.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14e6e84f5---wesomurekerutegalogux.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zibuxagigeg.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vezazoteruvariwamo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160711c1163a99---kufopezetuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=greater+key+of+solomon+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/mokozazurexupilivom.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 10752 bytes
SHA-256: df2f2f907213f2570811a9debf7e623d4f2678f9ddeec32810c622e3a5f3efbd
font_02_sfnt_off0001208d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208D 18328 bytes
SHA-256: a4e0c13048ec8310692fee202b59b2a31b667a57e6469928add2678bdf3b7956

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