Malicious PDF — malware analysis report

Static analysis result for SHA-256 c616ec585ccf2d50…

MALICIOUS

PDF

85.9 KB Created: 2021-08-08 10:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8a6e5f4aed3bbefa4dbfec19b5838f6 SHA-1: 6da3b08633e12037f954d5db85cf5d78e700906d SHA-256: c616ec585ccf2d50788abafa1ba6115701a40f304f78a9d5ce20e9d135505207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to potentially harmful sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/karaxewutuvakovupadudas.pdf
    • https://zemiigori.com/uploads/file/gufuvizov.pdf
    • http://bkht.vn/userfiles/file/kagajixesefonelugodakuros.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/g6dasna67lr8erq43bspoheo8i/vevufubemujobelimej.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/21f9cd86c50c7e8aa478efd2805e3cfa/76472908028.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609143007a224---fejof.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d962dca9---76309540926.pdf
    • http://asirakademi.com/resimler/files/37295810813.pdf
    • https://atraba-holding.com/userfiles/file/71521085755.pdf
    • http://galsabino.it/userfiles/files/wuketaxo.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69b454a42---27903958796.pdf
    • http://yuha.be/_files/file/16970113232.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37af2927c7---71679091018.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609e48e6079e0---rusafijega.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/zujurapimaxefani.pdf
    • http://skomi.ru/img/files/file/purigadifisibenom.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df217be5a9---60831770414.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079988bab172---xuxofupefidexuwixi.pdf
    • http://pneusmarene.it/images/file/41756602944.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajumuronurulajufepoza.pdf
    • http://pampa.be/uploads/userfiles/files/nevizorigotufuliniseten.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/30d9c9ff3f3140df389bc6e59683d67e/tapat.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/iurvvo7jgt15phubgb9dik5o0n/puvawanusajujotirigerebij.pdf
    • http://rheinmotel.com/userfiles/file/72536540799.pdf
    • https://hostessima.pl/userfiles/file/jusebozola.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e5766519e---50931402747.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/dchppvhnfuri7o713mlt4scnb6/mezemosofusunapogukanupuw.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/t456afspq2v1soe52dq26gn88m/7656259618.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+move+google+docs+to+trash
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 16792 bytes
font_01_sfnt_off000105b5.bin
a95d847043940facb2aaf349690f79f98dbc2b9a6c616e3c3992716931baa695
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16996 bytes
font_02_sfnt_off00013261.bin
26cf1a6f9c83f1c9de6c293b697cd365f2c1aabbaf698b4367b356a80c7adcae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 10764 bytes