Malicious PDF — malware analysis report

Static analysis result for SHA-256 7066e82ae25ab795…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 23:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cf18254933312ac5d8851d28493aeed SHA-1: e1b1deda779946c14fa5054a0ba6ffa391404fd7 SHA-256: 7066e82ae25ab7954bf248c69ce6624609c6757a204c01aad4717b6bdb2dcf96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. The embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/12022e66295bb4cbd2c18783e5c18b94/zerajigudapewufusesuwofa.pdf In PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/davavetakapimamasezijagul.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/bukisadetakexurokemipato.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/seragovimizunodikavow.pdfIn PDF document text
    • http://rentaruedas.com/files/others/51735775644.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/xufolifupo.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/renomevutagadom.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ed612d65b8763064b4c4e1cacef5b48b/gobuz.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/24906449727.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/vonoviliririnogidadufebin.pdfIn PDF document text
    • http://herve-coiffure.ci/files/sezuvujogufegomaledot.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/70474881128.pdfIn PDF document text
    • https://istanajp.net/contents/files/viwurimitanid.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/2689053322.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/88adb65e22bf8d8cf3adde260884fd0c/296631496.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/dagotutikizububufajo.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/vegolizagafaguzi.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kiminemedagot.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/45306826664.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/29782183215.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/87407984554.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/92965477010.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143361e9271b---vunikitisofukeki.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/kadavidokakaxijebuwu.pdfIn PDF document text
    • https://dacola.com/upload/files/xefiwefoboxarudal.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210915_055550_9094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ben+hur+lew+wallace+pdfPDF 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_off0000b1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BB 14748 bytes
SHA-256: 6754673fcf5b4ca91d00d978437fcd1c599121aa5fc788b437f2144f1b69a17c
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 10476 bytes
SHA-256: 62ec28c4c99c1441295bd88fd899e9a63d8bcee2a014088403252d956a51560d
font_02_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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