Malicious PDF — malware analysis report

Static analysis result for SHA-256 e56f58c9868cd510…

MALICIOUS

PDF

81.0 KB Created: 2021-10-09 00:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2592366fb9924db52f365da264a2ae69 SHA-1: d64cece6fb9b0408efb04f0030a57c218e6f71f1 SHA-256: e56f58c9868cd510f5bc2f4953108ac9b3e54c8eb828aa683b62b020d2095619
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, many hosted on disposable domains or compromised CMS uploads, suggesting an attempt to obscure the final destination. The presence of external URI links and the overall structure indicate a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=hand+embroidery+flower+embroidery PDF link annotation
    • http://flyingfish-stay.com/userfiles/file/44997059899.pdfIn PDF document text
    • http://sunway.me/uploads/file/140553135390.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202110031558178045.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/30929703060.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/powuvolosebodotokalutepot.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/66027887816.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/44211290729.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/51230540958.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/77789629896.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3ab7750a0---nuwaxeju.pdfIn PDF document text
    • https://limsurdua.com/contents/files/piromijinurimugidefamo.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/japopajen.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/25277440395.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5b7d630f9---molomajivutokiso.pdfIn PDF document text
    • http://inphilong.com/upload/files/wubojad.pdfIn PDF document text
    • http://praguetransfer.com/files/file/wezozetakepejedunavavubex.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/42487648934.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/36122073881.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/rejogiripabefesitedig.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/lilamabopim.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156fdb95a6a6---wimopizoguwesusoni.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/14807514416.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/24260645546.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/gajabejugukegagivudose.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/21b32a55721eb4924323d7bff7ed12b0/82550582954.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/69540352874.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_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 17900 bytes
SHA-256: 69b03eead1dbb06f54cf5e0aec6fba2328b607781186e1afe7cce7afce2eaad2
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD4 10580 bytes
SHA-256: 146d66d39db9755988b9962457a81c27a3daa5a313088d28132d22d1a6ef4f32

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