Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c0f2f8f9103f73…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 11:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dd4a9ce97b38d23c0256563556f2590 SHA-1: 45a680dc450a66938e87837bf77517493ee382b6 SHA-256: 54c0f2f8f9103f73b835e5df72600df75c8e2ec70ea6acdb3bef16742ed4f041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution vector, likely leveraging T1566.001 (Spearphishing Attachment) as the initial access method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97b7759bc3d54f31d39188649c72249c/15988242271.pdf In PDF document text
    • https://eyetracking.pl/userfiles/file/kawepubetaxaxatufekanix.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/84501862686.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160883caa471c7---41646964132.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b9ee57094f121f70253793f24695dfbe/67682296576.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/26254584940.pdfIn PDF document text
    • http://dzbnf.com/upload/file///lofinidirasasofega.pdfIn PDF document text
    • http://inncredel.com/uploads/27508655605.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df437b4f75---rujuxosi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d7f849cc---nepijusumakowadinuwefo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/wuxolixasudo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/38442809181.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jamiwusagafolebelemunuj.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a45ef1bd7---11420068776.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/bubero.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/25287493900.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/jemiluxagegivimutakegez.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/mazaferuwuzolope.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hac7ro98alfraa2s6mq9jr6p7i/kusulolugolefemilubozozeb.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/40533490141.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/104c2030f7dc7bdce8e50c575f3da1b1/22476556422.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/gutezagipojimomowexix.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/73880006882.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/tijudojesemopawega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+build+a+lego+nerf+gun+easyPDF 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_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 10960 bytes
SHA-256: cac448d636a82b888cf2af6f15d23730cba1ec2e30b2886aedc90ede22ce3fa0
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 17516 bytes
SHA-256: c505638c49cb4786e53ec2a2914aac530ddb205f46751fd60ced1da3ea4e01bb

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