Malicious PDF — malware analysis report

Static analysis result for SHA-256 a223c0c71e8365a4…

MALICIOUS

PDF

83.7 KB Created: 2021-07-04 00:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 509cdd34a2a17cc120637e54d52e5002 SHA-1: f43aae5bbd2d8aa395d7455d870b2ea83d908bde SHA-256: a223c0c71e8365a4e8adfcf0dbeb753a1392275996735f6ce16befab3af3d0c5
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of urgency language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rocksoliddesigns.biz/userfiles/file/bariweteru.pdf In PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9pg3f27o2bm4qfgjovaka1f7rv/38836186386.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/fu71v06feb2cqk609416l5oppg/6450660515.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e29ce655dabdcc92a4120fe663fc3dd2/17043065560.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/49a74124ba4494a38d879ec157693d70/kilexajubusisenulixozopi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe8343a59---tojiwofeketifosalekidej.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/zuzali.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/50149899593.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a2351d34098dc00747013b461c66ae69/xekogi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608655c7cf7a2---87077118110.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd3122c734---rogutor.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/pumuvinewamaruw.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b27e24be6c0992d5a769facc6c4a813a/matevonukimirefasivazoj.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1625145446.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/xidumejinemekix.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/21662047026.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/78219488618.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/juvemafimukozizabamiza.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608575edf18f9---57213412335.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/caef9e938c03ac432dbef03b88987705/kuzufawomamoli.pdfIn PDF document text
    • http://merwepizza.com/upload/file/wesenad.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zeluwewoja.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lnee7ufjrli4ceg9bgiv4t2mp4/44210247390.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/077651208b79cf17819ea055933a0cd5/mosubonipepebavovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+godfather+part+1+streamingPDF 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_off0000e0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 18052 bytes
SHA-256: 9a63ef9e07b29a2d1d94270ef175163a45db29d9f62cad1eeb7f60fb5018019a
font_02_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10916 bytes
SHA-256: 336c23be5797e810d15a9c5c19372f2cbc99c26da5c5168ed5a271de0650f3c1