Malicious PDF — malware analysis report

Static analysis result for SHA-256 474787b4f762b29e…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7420e4918b812830a07a518f2e214e02 SHA-1: b1a1871759ec72283bae8a28fe31ddc2c5082d03 SHA-256: 474787b4f762b29e54f33d3dc8fd7457a973461a9eb8360de80ea748b5010da7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d2b6ee989---lipuxuzegizebavo.pdf In PDF document text
    • http://thegioicamdo.com/upload/files/71556046218.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/pagubirase.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/zukeluxorusixolojopusun.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/86015613496.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/pemewekater.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/86db95bf6ee17a21000b597445452372/97285730104.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/gowanesavigud.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/57671762498.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/1955865792.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/tazevegufumerukex.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/sigipadujez.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369fc5e7590---20259468959.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/97271395448.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/19211269883.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/daverogaj.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/tiranorokokikireda.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/revajutiruxabatesidaxaru.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613495d2d380a---23282858493.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/sakuro.pdfIn PDF document text
    • https://majubesar.info/contents/files/noligabafizesorek.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/tizebagojasuxad.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/kiwemirugejaxo.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/tefutevewujizimijajikumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+delete+advertisements+on+my+phonePDF 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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 19712 bytes
SHA-256: 52b95139fc49fbe69ffc1d52c4a3ba47aa61549a86db6358fa48da36226f0516
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 10912 bytes
SHA-256: e8554f5712ed0007ac46fd79ea50453d1d591ca91e217c5bd532acd43d6677e5
font_02_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1