Malicious PDF — malware analysis report

Static analysis result for SHA-256 f507f2d77f3cfc4f…

MALICIOUS

PDF

73.6 KB Created: 2021-06-24 13:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41f33d7ac92932fa321107529380057 SHA-1: 53c0a6cd60c9237f8254081f69c9a7c2d645c4f8 SHA-256: f507f2d77f3cfc4f44711a00b1ccd4d035da45e2b4993e41959a49bffd0d63b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards the document's use as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 https://chcial.ru/uplcv?utm_term=harman+kardon+avr+355+manual
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f363c171a2---47875500008.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55aba4b31---vekedaso.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc4362c0d---kebufepexed.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8525ee2---topulasozogerezetudapa.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608454db5681f---nedoguwenexizafeza.pdf
    • http://fine-cottage.ru/userfiles/files/koxazoz.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/6480b44871ab5b43e9e6edf1d1cb58bc/29526749991.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d40a7d1e212---44035312670.pdf
    • http://nyett.hk/uploads/news/files/50693563567.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/abkfmp8haedma646biqfiuuah3/letatenamofase.pdf
    • http://yejida.com/userfiles/file/16525304099.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b31006abf9b0ef72f39fbeba889d75fb/pedunozevajarifevivo.pdf
    • https://anmoul.com/userfiles/file/28818988294.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/309c50868e5f9c7a76b971e802d4c519/pojixepozusezaxo.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4ebfb08ff89336162f7dafbc8687c9d2/62250350031.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7d146690cbbbe927fcf5ef1e21d735b3/30623307107.pdf
    • http://kaupa.cz/userfiles/file/79811638675.pdf
    • http://sunrui-ti.com/d/files/totozewuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d288.bin
4f1d2294d6328055c718e0246939be79ac003b7cf5676af191c9cdca237dddd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 5164 bytes
font_01_sfnt_off0000e40d.bin
28ad087d98907648b5758e6da31770827769b804f7c53c87ffad799d7f8f5cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 16860 bytes

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