Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2810d328ef4773a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 07:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbf5c72edd2c5ebd3c756fdb63992115 SHA-1: d427761a7a760c7ff80a97a8cf6f005fafa37521 SHA-256: a2810d328ef4773a6601dca3b1aa17319f65ace576dbe70b9d0c844ace9c8df0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/bavigozemuvajilute.pdf In PDF document text
    • https://rajakeempat.com/contents/files/54660141222.pdfIn PDF document text
    • https://ambalatender.com/upload/files/46829364223.pdfIn PDF document text
    • http://melabo.com/upload/files/2740703827.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/69932328266.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/88734580041.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/39550074859.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c024224af4fc1d3f903cb0a189c855bc/95847748648.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/89663345392.pdfIn PDF document text
    • http://blccy.com/userfiles/files/73352947852.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/xesibi.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/todikeziritobojesej.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/4683530049.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9da76724c3506123b58e9618c24b9ed5/45479151410.pdfIn PDF document text
    • https://tadimtursu.com/image/files/21190705214.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/fogiwudiseluwaxowo.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/nexikadu.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/29905404712.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/44180773999.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/82029624136.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rutepamadijiwibened.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/90371971634.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/fojevugiw.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/xuwafobobubawepubivaj.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613221e8d2aa4---53044367391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harvest+moon+fomt+codebreakerPDF 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_off0000d191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD191 17056 bytes
SHA-256: 12f23affc7dbd80b5b50412098936bac9a38a77ac08ecbec0e8fac061f2f70a7
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FB 10788 bytes
SHA-256: e28b064a764ce03014efe78384c4bba1a76b870f6299e01ecdd5a9c881a3d0c0