Malicious PDF — malware analysis report

Static analysis result for SHA-256 561537beec500c12…

MALICIOUS

PDF

76.2 KB Created: 2021-09-09 01:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e2ace085047c1d7101fb0c4b1db37bc5 SHA-1: 588d789698b93af30f65e32d09ff88f3874d6ef2 SHA-256: 561537beec500c12f4a11f9d0a430525c4bd3bcb6ca47911800fc65f99c1b522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tuzvedo.hu/elemek/file/60581871967.pdf In PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/81092045848.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/fesivifowemabiwizaso.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/17467692678.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/57977253504.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4d28a8b0---filezibulivupakikiguwisi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kukibin.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/25151007949.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18612605620.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/21211179674.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/29024750891.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/20409036636.pdfIn PDF document text
    • https://bczenekar.hu/files/file/80220538211.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/70648426463.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/5956075238.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/xezanugenuwuguluduv.pdfIn PDF document text
    • http://hexindechem.com/upload/files/xemiju.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/voxanidazawugizutevu.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/91903706305.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tdcg5t7obiill9d7c06g8mhb1/diwudisusub.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d73ad046e---8879314415.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/48079088486.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/36951382855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hacked+nordvpn+apkPDF 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_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16820 bytes
SHA-256: 6125580750e26f0272525f2c72ae664a7c369b52d34ed71c08fb8aed6a85e544
font_01_sfnt_off0000f3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BB 10252 bytes
SHA-256: 3c21ba833a2e690a71b0507926b20d9c48a002f33e946e34458bdd2b317ec480
font_02_sfnt_off00010ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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