Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48ea6a8590e3be0…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 217e2c12901373201c0c4ce5fa981210 SHA-1: 9f369bbbf7f8c21671ae5cb55277db80395215e2 SHA-256: c48ea6a8590e3be00a300e52041c0e7b841d7dabc56ff03fdd6d998f74691342
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/7351727814e7f033e50738106dfa6d05/ledaterimo.pdf In PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/22241039740.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/66488674399.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/t1d31io7lmcg9hr18385psddpk/dumegexivutoredijawidopa.pdfIn PDF document text
    • http://guchen.ru/d/files/45334641161.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae90863099---xisatapusojozalodubim.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/57291534748.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074aee94fb5b---73457701352.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/kubebobikibukavu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/bifapexafawivapegobizarar.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/fijefuguvol.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b1f8cbbe---mufedisimufaradi.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/bojewejel.pdfIn PDF document text
    • http://come2menorca.com/images/file/wosurawewapo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57754221253.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/11tbtvdmke7as3t9sn5m834rjc/kirafezufa.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a494c153d6c0b772c7eb37486ebc3c0b/vavowirazalogapifido.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/406c4d2043da4beb97ea7abc437ea604/97487627798.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/dixivax.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/42709530760.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/55937461279.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/xopoxegisafekodimokar.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/rukemimaja.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce827147c---fexifezujipap.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/i7hej7dp2oqqmotmf99rk6blnd/jonirokamiketexigezuzol.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077904ae8e09---verulebigopemadezarezemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=his+secret+obsession+pdf+freePDF 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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 10536 bytes
SHA-256: 2fb7bfb11c927efd71fc251485092f87346cfc62b1e0bcceb138b73681c02828
font_02_sfnt_off00011797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11797 18772 bytes
SHA-256: 57ae1f1298e374d13fde7ecfcf23c2573a13a0f18f681f2057f4f21ff35c110e