Malicious PDF — malware analysis report

Static analysis result for SHA-256 79e34e2286b9f2ba…

MALICIOUS

PDF

85.3 KB Created: 2021-07-28 02:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03d6d4514e28c3d9e692f21d8e716243 SHA-1: ddb0129d513ee3283925181c633cf07c656df128 SHA-256: 79e34e2286b9f2ba913a37e1edc13f9b1934ec8a6aa3813787c4c298a06fc9c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this, suggesting an attempt to manipulate search engine results or direct users to malicious content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.uc-kushiro.net/images/library//File/12256508072.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a3bba1586d26719932ad2655068328f3/47832779367.pdfIn PDF document text
    • http://soupworld.de/upload/file/risarivowizanolibax.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/mivekajafireludeneni.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/sonukekob.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/29652668275.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/20689294169.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1c84c374---10236809756.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf727c68299---jiromovajakipugaz.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/rsiphvep64a86sji29mlmvbnaa/xuzasobamojotimalodip.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/62438872886.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/pijujavanikigalawewam.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/8744e1530d9fd347e4b44b0d3db3897b/72111928753.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0cf1b4e4---81223446376.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/mowitaranafexigaroma.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/vulogufesem.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/69590227681.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/45442388936.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/wolesolufafosig.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/valoluvedufumuw.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/01fe70428cd163a4fa47eeabf3d3c201/67528218947.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/54a574cdafc619234825d2759cf36c37/57039633251.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e607987e659136b72177c28d8c9e8482/sokifalixelufit.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a9htuoh1akrqd6sukaku6pufm/pisoxuzogu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210709185305.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/waxuwepebodiwofutatatel.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/norinipileranitesokof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=o+hobbit+filme+completo+dublado+online+gratisPDF 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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 18424 bytes
SHA-256: ab11306de22128030c863e66550912f4052621f22817da537df1113432806336
font_01_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 11332 bytes
SHA-256: 8b304791f0949f0bef690b9d0514b9fa043857041078937278bef02edd0ebb4d