Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d93dd2c343f4aa…

MALICIOUS

PDF

95.4 KB Created: 2021-09-01 06:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50494c5a8a88f627edcd2be0ad72f68d SHA-1: a153646a01ae1465f12b355600af61a88116db53 SHA-256: b2d93dd2c343f4aa6f13d987e4548dffce24e5a774c823c92443634a96e3ac29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by a ClamAV detection and an ML classifier. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=reflection+paper+about+job+interview
    • https://larustt.com/upload/ckfinder/files/92223315558.pdf
    • https://cuacuonbentre.com/upload/files/2569510615.pdf
    • http://thinhhoanggia.vn/Images_upload/files/nesoduxi.pdf
    • http://kolaykanal.com/userfiles/files/koxed.pdf
    • http://beepost.vn/upload/userfiles/files/27066340270.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cdb3bf3ea7a58ea0acdba2e47aef1755/22495279484.pdf
    • http://stlnsk.ru/uploads/file/82212315171.pdf
    • http://aweibel.com/Photo/file/94011830103.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d007a9b5069a64e0222545f510cd7a70/14737305080.pdf
    • http://fresh-j.info/images/uploadedimages/file/nitifaxufi.pdf
    • https://loctra.net/userfiles/file/wegeziroxiwozogujifanenu.pdf
    • https://xedulichhaiphong.vn/images/news/files/porovuviporiz.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae3c482a02---sopifuxirelovutirom.pdf
    • https://grupahatak.pl/admin/_fck_files/file/vivimefazufovafeter.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e21027aaf3f---21111035689.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160872229a9423---senudekak.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1830225af2---22149693953.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eaa569112---sowamuzi.pdf
    • https://livres-d-art.com/ckfinder/userfiles/files/wanugi.pdf
    • http://goldenteriyaki.com/uploads/files/22967872109.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/talisavigevab.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/revakepowowaja.pdf
    • https://hijaulumut.com/contents//files/70170858868.pdf
    • http://www.niziointerior.pl/upload/file/redodamuxumof.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_off00010d2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 16792 bytes
font_01_sfnt_off00012545.bin
fdcbb2ece5e6587c1b3e726e3f32ffea8b9d1b50ea611a20b300a77da74dfb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x12545 10872 bytes
font_02_sfnt_off00013e4d.bin
b392d5b039c2d0ff555ef9cd3b64f26fe9d85d8f78e6dada2c23032e688634b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 18472 bytes