Malicious PDF — malware analysis report

Static analysis result for SHA-256 c705fa339ca7e222…

MALICIOUS

PDF

89.5 KB Created: 2021-08-17 15:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abb7573e88b2f943d6a02ca4c686270e SHA-1: 2f698c8fda0ca859718540be30afccd112f65865 SHA-256: c705fa339ca7e22272520332e4832a936c571dde754184776d04576f828ded04
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, which in turn link to other PDFs. One of these links directs to an IP address, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ba9e6547---farixoga.pdf In PDF document text
    • http://77.158.216.156/ckfinder/userfiles//files/papuborikevekuwufategema.pdfPDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4a4363dbd---pizujixe.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062310315180554.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/91434057009.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10fca9e446---tuforaforom.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97f2ec76---tolir.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/45893254571.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/o06j4bek3f0d4265rvhk008kio/tizuruno.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/97551353892.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8f5ht62dg048b63ufpoao529p2/69826898942.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/40a9f710f70b91c9d31d8f417229ddf7/fixolesidi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f4356c693298e054d85fe7fd0cce94d1/zubudulibi.pdfIn PDF document text
    • http://navigator-33.ru/media/file/91133672088.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec6a6dddab---vexeb.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/78617928514.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/17490111276.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/9c35cd9e9b5a9af718ce24ae3d331275/23450329165.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/86492917045.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/4779422856.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/6ed28c540f8a3f0273d7ef0563b4fc05/fetegirunaw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecad6796c33---49041369931.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kalufidas.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/febakimezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=que+pobres+tan+ricos+capitulo+100+completoPDF 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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 18744 bytes
SHA-256: be5ec31182719e54f2e686c3ac1eac5cbd033694f4dda40944d0f7269ce6fdad
font_01_sfnt_off000123e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF9 11008 bytes
SHA-256: 5aeb366168a5b5fc27aa6930234804c0f8dfc92d56a6043ec55acd5d7e76fcb0