Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfb5700bf42b67d…

MALICIOUS

PDF

89.8 KB Created: 2021-08-09 17:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c69659b837dafe2474f702ff306eaf40 SHA-1: 5594dc4b84f885ac7d2b0bb6ef98d2e565d8fad6 SHA-256: 4bfb5700bf42b67deed22b4c3f03f6791e7e68db740d2c61b0b654233efdd40a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, including a 'download button' heuristic and instructions for a password-protected archive, suggesting it's designed to trick users into downloading a malicious payload. The numerous links to compromised CMS uploads and disposable hosting further support this malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f0924f72---21619661474.pdf In PDF document text
    • https://soltendance.com/stockages/files/28411126877.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e594a3f3126f80bd32359d5fff5e2b2c/kirewenigalobedamuwepo.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/70032217651.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/72561343133.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210609111120.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/u16n422i9m372cgne6vmql9al1/22032343247.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/biroxikexe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160810d7accc2f---54651643731.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac603d8f535---gugavavawudasemidufuz.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/kedozexetakapupudal.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160832f30e81c9---zijiguvixoroximotux.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e4c411ff---roxujefurutu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16105534dd28d0---vewoxidadunoviwu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fc6b461a0957ed51a16a748f93c47089/77172802703.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae3e98e19---nepoluwobefaviwi.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/l7tltodlgqvjvpb3qn28lvf6k1/11929777294.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/jugagiregegowijijil.pdfIn PDF document text
    • https://aromamarketing.md/img/files/6071376113.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ed11ba8df23---livifilugogunizedaniz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/16187439642.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/82066257470.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/n3uj0bjpmbgi53aqp9ibo3t23c/3908609555.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210722_4BFE6BBF7E0E56FB.pdfIn PDF document text
    • https://fallsplat.se/file/xisixuf.pdfIn PDF document text
    • http://com123.vn/uploads/file/54397754059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+game+gta+5+ppsspp+iso+androidPDF 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_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8B 10956 bytes
SHA-256: 6335290d12400258963fa1772a28bbea7d0f0391b307304ed6de246ffb1762a4
font_02_sfnt_off000128cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CB 18836 bytes
SHA-256: 25543e329582f643a7349a6b02b93a9eb7a128fb70448181122c95aebdc5d5ee

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