Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b6edf0a59b49c3…

MALICIOUS

PDF

81.5 KB Created: 2021-08-07 01:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 27e53b4699dcb64288793c6c8a2fc563 SHA-1: 2653a2993b6a4d6e7e041205c76ec50c33f02abe SHA-256: 76b6edf0a59b49c30cdcc2365085892ca70a614e5141cb3f0a235bffb67f27d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised or hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://meteosputnik.ru/userfiles/file/gijowepuloxakin.pdf In PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/kudujusinozuwoged.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/47p12u5a5i3jhl7bh0ks45c9q6/wukogetevikujejuduwejirep.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/wumis.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7fa511d9---duzasewixixenexinunos.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607070b84cd36---biwutadujujaraw.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/fejabozajoxubuni.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/37022064941.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/59981217385.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092395c54ff2---73766652419.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/siwumewudaf.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/vebixadefopomurizig.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/65852281630.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b124bd64a8e---99673832213.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/kibodiravevekidazepolama.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/34b1eaf9a021a551cca2ba503372b4c0/17098489889.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086b08d848b6---jowugavuzu.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/jozolusumotinojab.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/b0ab2eed03e0f8e77bc9cd9bc2d218e5/61000515680.pdfIn PDF document text
    • http://atek-ent.com/upload/file/zadamugim.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/zuvomedi.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/rewovemagupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+use+sentinel+leak+sealerPDF 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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 18764 bytes
SHA-256: c24e60bcff679754cff9a821f5e2d37a3e896f88bfe4cf588904f306ad213517
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F45 10368 bytes
SHA-256: 635c2cf3a2b6e3635f045e3e072fbd55cb1aa7c0146e339800e6918bbad12ce8

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