Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ffd15725468332…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 06:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1a3278baf0b6c70a95c125da17dfaec SHA-1: f18b14232a7dbe59376e0911ee4533d6ad8b4f5c SHA-256: 70ffd15725468332e12a2fe46dccb55b23b6de1b6a724d9c986eec3749527bdd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable domains or compromised CMS upload storage, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adikmanis.com/contents/files/94458811692.pdf In PDF document text
    • http://mebelhotel.ru/images/news/file/fitogipis.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16136a359a647d---28816140814.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403b66089ba---9722896866.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/ritedebawes.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/67731452425.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210917141235.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/81192797954.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/jovipijowevugimolus.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614443b631cb6---2749319497.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/rujunutafupiri.pdfIn PDF document text
    • http://djpress.pl/Image/files/17624554116.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fazakiveliwulal.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/25292741062.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/61142049031.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/jevoji.pdfIn PDF document text
    • https://songhong.info/userfiles/file/81370942551.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/41811829650.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132e03c7dd17---legowogojofutut.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6bb37b383bd93a2c28f438a4938369d5/78000906625.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/86948239157.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/piruzofiza.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145cda04cf42---lubozavaf.pdfIn PDF document text
    • https://digiconelectronics.com/media/nuwulefudalufexowuziseba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+make+your+own+live+photo+wallpaperPDF 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_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 17516 bytes
SHA-256: 3a5a2268512797dba34fa062e11f0613fba3d224d8e9c2eae5819d7979aaefa7
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 10796 bytes
SHA-256: 23477ee739c4743ece12f8ba4796a7bc9e6d1b76c9645b8e7ba3acaa29012913
font_02_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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