Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ce948b1f586611…

MALICIOUS

PDF

68.2 KB Created: 2021-09-18 02:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ce34ee1f983397c92810e63f7f20642 SHA-1: b8930a5140fc1978aa3f41af915bb77ccce22793 SHA-256: d8ce948b1f586611162508c1bc835517fc33370a101be4e5c677f1aa0d6be927
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or malware delivery attempt. Numerous external URLs are embedded, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with techniques used to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=la+meta+pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c625b3b0---gipuxudupekopixipid.pdf
    • https://doxity.ro/ckfinder/userfiles/files/dedifunipejom.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9a91f2af---60883938062.pdf
    • http://mgrima.com/files/file/33697238634.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/totakegudujajivewet.pdf
    • https://rowsontw.com/shopadmin/upload/files/duwivaxutesigitotedimo.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/reribogaxuwome.pdf
    • http://sarljarry.com/userfiles/file/puwafas.pdf
    • https://peusch.lu/userfiles/files/fosamo.pdf
    • https://chiataiec.com/userfiles/Proj_Name/files/15578526032.pdf
    • https://krossi.ru/images/content/files/jazimajitabufowadedoxuk.pdf
    • https://hongmao.tw/uploads/files/202109082259012406.pdf
    • https://santchavarabed.in/ckfinder/userfiles/files/pofoji.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff0f70c3bf---52583206655.pdf
    • https://needlugs.com/userfiles/files/lodakiwonexas.pdf
    • https://rubfila.in/files/file/rozelebasevibasa.pdf
    • http://betonkeritesek.eu/Content/files/27560622700.pdf
    • http://studiosantomauro.it/userfiles/files/nobubuzetigukoguwazegafi.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a07a7b170---mupopefobufefok.pdf
    • http://falerisztika.hu/tmp/3810808618.pdf
    • http://kingsap.com/file_media/file_image/file/55622280674.pdf
    • http://seanmore.com/userData/board/file/sukirizip.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gelekakubozototuliw.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe104c2a1---pixekav.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_off0000afef.bin
49b71c0b18f1f0389f9ca4b6f74d0e3aa3847a51b2c0569422f3d8fbf5136aba
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEF 9988 bytes
font_01_sfnt_off0000c60c.bin
98d1c5d1eb2856a0f8846f436a36126ee7633b83c14f7c56cc3d0d3074281228
pdf-font-stream PDF embedded font (sfnt) at offset 0xC60C 14924 bytes
font_02_sfnt_off0000ebbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes