Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d15dbf0c9c47c6…

MALICIOUS

PDF

89.9 KB Created: 2021-08-31 22:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07d5c23495df6834531b1f0b7af3d72d SHA-1: c26cebb32f93cabee938c70e95de770030c2e77f SHA-256: 82d15dbf0c9c47c65d98f5fa8dca3e1e8f71b6831ec430cea0b0e01b167a308b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, directing users to numerous unknown URLs hosted on compromised CMS uploads and disposable domains. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/30c233122605af5f5be381a18941eddd/zezokogosamodajara.pdf In PDF document text
    • http://abworder.com/uploads/files/dasiniketetamelatud.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/medojevuvarelo.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/nimumepo.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3bc61f05779a1cd4b05de5938498c700/81321086721.pdfIn PDF document text
    • http://skupka23.ru/upload/m/92806277839.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/duxipojijakaletabofulemaf.pdfIn PDF document text
    • https://bunianco.com/other_files/File/sazaw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/4315609609.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c41cb65a073---meganexigirodalenawakof.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfe9c6fb8f---14542462927.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021052905362573499.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aec9787358---32571726587.pdfIn PDF document text
    • http://ubest.ru/images/file/78561056396.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/4333280130.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160727467b48bf---robiretisonubopafopaxi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e03991914---61497484623.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021781553167801.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/zusavaxoxavasemezuxozel.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/34781283996.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c0b217b88a385f3691b310da4006526b/sogosatitavapukimigoga.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/08db07dcf2a84cfe65ffd97f19fe8d97/laxuru.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/xamawamara.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/30615256829.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/34592947462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=growing+rice+in+containersPDF 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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 10484 bytes
SHA-256: 9e34b36246de379fe45e50970d723ae5e86fbdab189c5137f47bb0966d804d87
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 18544 bytes
SHA-256: e6ca9be86ca517ac147c9171bc13052c0b714c31219cafc063c041900bb1f5fd
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1