Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf79442b4a1baab5…

MALICIOUS

PDF

77.6 KB Created: 2021-09-05 04:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f30560d313180c21fc544294e2997a8 SHA-1: 45eb51937bbec25cdc69d850bee6c2fe8146cf95 SHA-256: bf79442b4a1baab559c6105230b3b14219bd5a9255653c9f6ba030bef2cc78c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. These links likely serve as a link farm to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://wastran.ru/uplcv?utm_term=actividades+plato+del+buen+comer+pdf PDF link annotation
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d65d1213f---34731708821.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/kevixividulalowakize.pdfIn PDF document text
    • http://aa-nusd.jp/64230892603.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/kijasenutirit.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/duruvamamu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f26e069bd---74674793733.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ccd0c8b6f---dexamine.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5454e68f0---fezelap.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4cd9507c6---luvarutemewefigefezosaban.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/26909928387.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/28fc16154bc0361f12c6ecd803af9343/rofigubuvaxulebiganarese.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c161b28cf95---91444838208.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/5d7nln5oveobrmh930l7n7lfqc/38618502358.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0up00me4tjnshs8t3ulr30ij2n/95819469009.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kejeritazisuxufowusiloze.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdde68920d---juwamewozubet.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/44671658495.pdfIn PDF document text
    • http://pinxedien.net/upload/files/53967248038.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/14717630939.pdfIn PDF document text
    • http://debden.org/userfiles/file/bukupajolefidixipiwu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8476fafcb7---35871892.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/shbtkf4568j39pb50vsghslhoi/gorosatowutikomen.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/feb20cd7a498ce8693ae775ad020a598/18621170800.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_off0000c955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC955 11068 bytes
SHA-256: c0700e5cafe85543e32a76bba2905678b5c8c1d2284ecfb0eea60f39c33dfc57
font_01_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 17424 bytes
SHA-256: 2b19bf99e67791547ebf099ceecd76c238e8d779b2c7001f4764ae72e7d05fc7
font_02_sfnt_off00010e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.