Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba11cdc893dd34d…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 19:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e336baba026324a4b7a7e808f9b4c382 SHA-1: 033b16588c63de61359c5f6add86b0a50dff464b SHA-256: eba11cdc893dd34d97e524e3d74197f88eb5f88665aa73e691bd31731f256234
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on various hosts, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=battle+royale+games+for+browser PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/34726528486.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/42223385535.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/jejojamojevefaw.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99290092409.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/96631423466.pdfIn PDF document text
    • https://securitydm.net/slicice/file/mabukinusegubopilanoke.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/7349103819.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/junurowevujisen.pdfIn PDF document text
    • https://gencatakan.com/upload/file/noniwus.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/71793568261.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/18113273939.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/murino.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/68164943929.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/zebenikafi.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/94364974773.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/betotelojizekosis.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_2C569ED5A21D4FF2.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/73884058632.pdfIn PDF document text
    • http://www.bash.cl/media/file/sijufexeganagaxitaji.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/13977362791.pdfIn PDF document text
    • http://jainfarms.com/uploads/67064375901.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6377fb8cb7b2a070ba548428e2a60287/futupudem.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3f4qna8g5epae566hgb43bglmu/18181877187.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/03912a785024bb891e4ec79f6cf04e46/bumimadikisevabevevo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145539863e2f---voxatukabarubojowujepuza.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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 10756 bytes
SHA-256: 5ef0fee5d0cd060f5601e3382b7fbda77edf783fd2309f5cc8c3c0c454206444
font_02_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 15024 bytes
SHA-256: e0c9594365e959e1ea7697cd3ac0026740100cd38b4eb74fbff03969fa1e4dae

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