Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa48cd8bbb8019b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 18:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e4e734582b26688fafbaa31ded2f53c SHA-1: ff0cb367c8c21554286b1f3e85709ec37d467d51 SHA-256: daa48cd8bbb8019b50e82e47edabf549bbb9f98625274701ec5b38e9ad2c1c10
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, suggesting the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=utopia+comic+book+pdf PDF link annotation
    • https://kalyna.ua/sites/default/files/userfiles/file/81765995761.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/41788353175.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382aa50bc89---zigiluse.pdfIn PDF document text
    • http://sbairs.com/datas/files/bozomexirijofefajev.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/geluduw.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/sisuwukofuzabefarixak.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/66274008893.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152aa553d940---jinonuziparomos.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/94309880735.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/15f8e9500f450fa757fcfa9569c6c579/devilositusegudup.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/21394658900.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qtjfbhe2u4an3a0q9u7vus0qs2/kufekabemuvifafilafig.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/bonefoxulite.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/1354241461.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/zagotibaw.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/91690486547.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/fazotige.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/93637610525.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615262af1d65d---50764276585.pdfIn PDF document text
    • http://yibetter.com/data/files/rupulude.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/88366265819.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/fawitogelokimajinad.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/zozagasinibowamesozik.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_off0000b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23E 10472 bytes
SHA-256: 0c05c063f34fa39bde5e717915e101115a23dc537a377cc9f674fca4115a8de6
font_01_sfnt_off0000c9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D6 15584 bytes
SHA-256: 504dc97d5a8593f5c16751a600fbc13292aa1cb50f42b89f482a20e2ff1197d8
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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