Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b3b707b1ac223d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 15:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1d84ba5b8bf0d390826b82e449463fb SHA-1: 5e8f938254cba6d6c89551485846dbf8cf1f1f61 SHA-256: f5b3b707b1ac223dfb4d4e86d120f0c24720e685fb6a2a5afc037281aad474b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=la+princesa+que+creia+en+los+cuentos+de+hadas+pdf PDF link annotation
    • https://lemarko.com/userfiles/file/79792721334.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/xonilezedofamemepo.pdfIn PDF document text
    • http://art-ball.net/files/file/96870092123.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/baxapakuxakipumovuv.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/29320966263.pdfIn PDF document text
    • http://juha.be/_files/file/bokukawebawagisufuxad.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zarogolekaxiribakabiteje.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/puvapokalokexefexetejujez.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mewakowugaxuvobumof.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f103caf4---tumajawopiza.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/385ffc64ec5746b2c8a54070ffd1fd69/99909687396.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/69134018137.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/59633756149.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/kenegevazidezufefo.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/lozesajulel.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/lopivudinebitesodok.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/sewoluxofijaravazafade.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/61964489021.pdfIn PDF document text
    • http://sissonne.hu/editor_up/xipusos.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/r3d8hn9162hv4jevr8e2evp2p7/juziw.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nulukoxujunowumewolufuw.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/57954585549.pdfIn PDF document text
    • http://c-six.it/userfiles/files/vegezopitetegewefi.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109070903125560.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/nozigimu.pdfIn PDF document text
    • http://master-br.ru/img/file/57888828941.pdfIn PDF document text
    • 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_off0000d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 18408 bytes
SHA-256: aca9cd93a43d96d47295cc8576d64642f594fff478708bed1df3f374d2ef3e8c
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10920 bytes
SHA-256: 3bf1389c7d146f88483e9e9b083ec6edc89148d63b7d5ccf0812df9e19e6c0f0

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