Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c10c61eb90bb12…

MALICIOUS

PDF

75.8 KB Created: 2021-07-04 05:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94bd4f3192c321c08a9b7d39d5ac9ef3 SHA-1: 761bc67540276b6a32d71d382d20c89fd25d1f94 SHA-256: 92c10c61eb90bb12135da54f63ee58f906c32ca3d75c1fdf75bbac31c4e37317
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 functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute malware or conduct phishing. The presence of external URIs and link farm characteristics strongly suggests a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=mytv+malaysia+apk+download
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/40878a4e289caa67cf08e6fa788e73ec/38075148211.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfbc1c1db64---vunasejapusos.pdf
    • http://asiadomainstore.com/userfiles/file/81093956764.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609448f18a306---1542256776.pdf
    • http://peaktoppet.com/ck_imgs/files/83836071674.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/d22qqfrajj559dmuaure3s1vk6/63112395179.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160903d9b4280c---78246465468.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ui61f56ecqb05b7hfln2ggqmc8/27199587870.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3c0151b65ec7917ed36fb599a726ec67/gomufabigibedozimujozixo.pdf
    • https://atkarisuli.hu/userfiles/file/bazomajikimavu.pdf
    • http://cascinamana.it/userfiles/file/46372174812.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f425f0a43d---34227130641.pdf
    • http://hawks79.com/clients/85064/File/boloberowago.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5e0bca5ce---taxexutarivu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ec9fb0b4a2d0d70094a8969f809e0f7a/vesatadivetowot.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6q8r51ph1fsqnv14golv7hjf25/gorurexeviwopefezizusef.pdf
    • http://chinawin-consult.com/userfiles/segotisazidejerudiferow.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5472e5ecb0bbed49100d55a3970eb066/niruziwumasolo.pdf
    • http://casaatlantida.com/userfiles/file///bizimibedodeseferujopaz.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783b324d2b5---mepisonawitu.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeb671c25---76564490592.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/42127521055.pdf
    • http://andlupa.com/userfiles/file/tokexod.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59c.bin
1ebb98f3df9d0bfc81e814d1e222b0c3b0461421a7f5b02a199bb048b6b2e6f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 16912 bytes
font_01_sfnt_off0000f1c0.bin
8badbdf444fdcb3173078627c4d346ac35b451a3ee77f048c449924c10833041
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C0 10672 bytes
font_02_sfnt_off00010a3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 16792 bytes