Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8842e892b82cc48…

MALICIOUS

PDF

69.9 KB Created: 2021-10-10 14:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6ac9e87221ffa0e804190e72cd4674de SHA-1: 26b02cc64100574b450e9df588c0c62e910fc66f SHA-256: f8842e892b82cc48c93aa6c55612f2e96b9a3071cd0ea6c1be42804294f09740
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://come2menorca.com/images/file/jijepuwopemeruzumedaxanis.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a344784823---57981794904.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zasajeripazujidodepixux.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d950151733---37698377869.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/29379328064.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd3f0f896---mowixoxakuk.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/zajojesam.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/65192661566.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/pazegebo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/verorugepezijal.pdfIn PDF document text
    • http://hakemokulkiyafetleri.com/upload/ckfinder/files/zupikinezeviz.pdfIn PDF document text
    • http://mebco.ru/images/file/kobebabevero.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4a563d71---monuxi.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/sasubigekojunulodut.pdfIn PDF document text
    • http://ihdbd.org/upload/files/saxuzaju.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/gaseguzamedatexanugotodo.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/kigapidadasasu.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091822011573499.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e6ft09h7l2l7l99d3q1543q830/55989196915.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/lekup.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e74c5e1d7e---xozimawoxipebol.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/wapajegebapijop.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/212c3934ced7bb7faca687a57dcf3eb4/65622493100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=open+pdf+in+preview+defaultPDF 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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 10480 bytes
SHA-256: 609d02d2c7b44681fe0abe745153e48c5fc1c15a8cb5c4e52acc04844ff77eca
font_02_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 15348 bytes
SHA-256: be137f9a5ea79f237bebdfd51fe2bdcaac8851b52fa179b9308675c7d949805f