Malicious PDF — malware analysis report

Static analysis result for SHA-256 79823b048ba81f80…

MALICIOUS

PDF

96.4 KB Created: 2021-08-14 18:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ec294905bab7b370d6b95575cc0ccef3 SHA-1: 1e6b0a2967c09f6c7ad41cc12c43bd4bdba54748 SHA-256: 79823b048ba81f80736a0bd21d735d80b4ab3346124073583c3b34067ab7030a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b05d58e82---melusadoma.pdf In PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/47738412084.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db4929cf430---lofet.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/liwozawo.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/98485140403.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a63fb73605---gasamujawexelebalowu.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/56676854057.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/58688404147.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/13976869732.pdfIn PDF document text
    • http://pk.mo/userfiles/file/35759050663.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/2cafd4be0c4e7ea55e267b57a8397679/pojajugejexowe.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/guxevozazawakovo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/bizimabefazelujiridilojo.pdfIn PDF document text
    • http://perksys.com/userfiles/file/79719857947.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/74239663579.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfc653f8a8---79594271036.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/wanivogidigerumoganub.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/7019709054.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af668dcd34e---lupalumitifage.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/foxakik.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16094400310d32---wenurawewekevep.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/zisaretonoduri.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5565d1c4---seponinesixadi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j8d547kanlvopmcfor9srn3lr7/dogif.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/figaweritizuzamavixudevuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=massage+r%E1%BA%A1ch+gi%C3%A1+ki%C3%AAn+giangPDF 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_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10880 bytes
SHA-256: 8926118bab7227f4e6f250fe446f8444ef3b72005e6ad4f84c51daa253995b5d
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 35172 bytes
SHA-256: 8586e998363deef442fa43d1df11ced28b1d2bd48a281d96eec9b157292ac3b3
font_02_sfnt_off00015915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1