Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84704f29ca1576b…

MALICIOUS

PDF

92.7 KB Created: 2021-08-06 18:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b846d5fd635626e2cc3f8362104e4f3f SHA-1: 32b31a130468d9a7a439104f6e4aa24b58e62e2b SHA-256: f84704f29ca1576bfb86178258029f8bcd9e2481bb5d48dc792b40d76c47d7d9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing and a trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites for phishing or malware delivery. The file's structure and the nature of the embedded links suggest an attempt to exploit user trust through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=limitations+of+absolute+advantage+theory PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1a665ebaa---5081371530.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/lidukixotagaxuta.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f5032d8d8065f27eba069f46de57dd52/wefovilinadawejumovitigal.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d90ca83ca6---47944642110.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cdc0e4397---99949365370.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/novadorexoni.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sqkm61tmg5eqr1bkni9200avbo/39124993336.pdfIn PDF document text
    • http://keramann.ru/uploads/files/59319146687.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/93681314917.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c6f3033c6---66100609442.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/pejilabulibasa.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba781819040---69390392608.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094da52138d7---28019639553.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bnf38a9c895rk4cki6h5nj4qo9/nulivadota.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/i4g0vtjpr5d7kivn3d4vm5u2j0/28677394461.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/77977933082.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/naruxetefefumomugemu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac8b06867---jatobafadufekosojalikaviw.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/lorirel.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/192ee9792bdebab748935b77f58f559d/23939168111.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1303e63a8c---51679748614.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wekuzababefujuno.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aca98066ef0---deruzera.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d07514a---98642231920.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_off000103a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 17800 bytes
SHA-256: 7909919e9e9a1315caa3ba8feead2d7b5ee78cc9a04aef0119d4d33d4fc3b061
font_02_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 11176 bytes
SHA-256: 9e25aed7b12c69551c21fa0ed135bc5e9e1b98183fe83c2d25c3aa4a46c48ddf

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