Malicious PDF — malware analysis report

Static analysis result for SHA-256 2480c441110154c8…

MALICIOUS

PDF

85.1 KB Created: 2021-10-05 00:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3f5edba87efb1e1e9f7166553dc75d4a SHA-1: 65332acddfde80535d72344e811f3da89b6cf17f SHA-256: 2480c441110154c81b56161cdbbadbc1e31e08a253df5697aef73bb8e0860880
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used for distributing malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3hd5ueblq0s203jfvlji0fdrg0/lixepeputujefexamodozi.pdf In PDF document text
    • http://come2menorca.com/images/file/44739900103.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/16198906227.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/91777942568.pdfIn PDF document text
    • http://health-bridge.in/upload/file/81528448738.pdfIn PDF document text
    • http://opsir.eu/files/file/raxukijuforodikepulizerat.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/50090825789.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/67837027953.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c00a36690942bbf45d7d6e2b2aed55e/paserekovimagibatu.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/15025863046.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161467ed51ac6b---36821297409.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/jiragusugunoxedux.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/zigome.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/57503680423.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/77727377212.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/fexoputomiw.pdfIn PDF document text
    • http://metallpress.info/files/folajagolipoxajopuninowed.pdfIn PDF document text
    • http://12shio5.com/contents/files/kinakegunumukiz.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/papukuroxapukidagufumefaz.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/rujiped.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/getivabozed.pdfIn PDF document text
    • https://trainova.com/userfiles/file/fexokuxin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=business+partner+b2+answersPDF 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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 10576 bytes
SHA-256: 56074287a80e2a06a9e0c2a63c3979490c9b3f2f6ff790d83296ab6ed517f941
font_02_sfnt_off00011540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11540 19116 bytes
SHA-256: 2dbe2125cd92f48e7bb04f1a15f5bbec4a5e4000c7573c4f7448503373e17782