Malicious PDF — malware analysis report

Static analysis result for SHA-256 780d282b6c5af6dd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 15:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d29c502c3d98e5c1dadb38b9b923085e SHA-1: 366e30405f5fef213165f92b8e65c20972b485f0 SHA-256: 780d282b6c5af6dd301704926a659f4f54e7083c2d80c3f2019f8dd03339395e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting a potential for hosting malicious content or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://gbagencement.fr/uploads/file/mejawat.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///jagumeguxeluse.pdfIn PDF document text
    • http://apsons.eu/files/file/gapazegotudutevikono.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/jirexeg.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kuxuditununopebalin.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/84159106534.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/44495182666.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-16/20210916131723911485.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc8cb8a59---nalebota.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/suwos.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210909205719649.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/80938335734.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f7s0a3e79fkcvft9o39pfg3h4l/25927288606.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161409ad63ae1a---55891611166.pdfIn PDF document text
    • https://cian.hr/userfiles/file/tukonijavuzulogevoxagunox.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/16874102160.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/16835179721.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/43262610452.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/62042437585.pdfIn PDF document text
    • https://ksboutlet.com/file/files/92434219310.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210907_20CE84B12655E98D.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/58140758601.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dikedeloz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/28959902910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ad+server+interview+questions+and+answersPDF 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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 17592 bytes
SHA-256: 5b103a72cc19cab0ed2de7a8f8f35df5c16750bf36c0107c0a80322d78571db1
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10576 bytes
SHA-256: 33b9af7295f445513696a7ccc1bc173f4a24a8f1a45c3a3918bdc06c3d549ed3