Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d5f76f12b2f45c…

MALICIOUS

PDF

88.3 KB Created: 2021-09-09 09:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8de442e0782d95559c6ad483b2ed2049 SHA-1: 38ec325aeeacfd4367ef5e295b3e38b58268c848 SHA-256: 17d5f76f12b2f45c18cae313f95031dade969ee759e6f3f9a629f9f6f7046521
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam. The file's structure and URL patterns align with techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=cheat+jetpack+di+gta+san+andreas PDF link annotation
    • http://pttaccounting.com/userfiles/files/jutuba.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/60084251839.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///85865616935.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210907095651.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/79804701504.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/20254113149.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/kenaxurop.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/misiso.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29514823773.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109020207416545.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/sezesadiva.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/51734393876.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/nojed.pdfIn PDF document text
    • http://gro-felix.si/uploads/44041004119.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/ou5920lnmmftpfetfanb9gjgd2/51209097402.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vavekuvuxivomadubemakebi.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161356e796684a---petelunarilatinubov.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/fuvewukikuropitalawusenos.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/12970411516.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/mimedukesufupuxufawired.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/wuxefutabupanixaxolip.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613430cc078fb---67167029746.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/lesozeg.pdfIn PDF document text
    • http://clingac.es/d/files/31831786243.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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 18304 bytes
SHA-256: 207c976bb9f9e6b633a676ade6fa0ee6c25b8c752b438a672c57da89f7894a2f
font_01_sfnt_off000122bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BB 10880 bytes
SHA-256: cbe5634a64c7bebb203100706d28ac1466ea6064c9754e69f6c5c66e787e2ddb
font_02_sfnt_off00013ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1