Malicious PDF — malware analysis report

Static analysis result for SHA-256 96381d5cd2b4cfbd…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 23:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17de8cfaa22206a32bcf52c79d97c2b7 SHA-1: 0eaf55000593bd96eb4f763dde98068b35c7f41e SHA-256: 96381d5cd2b4cfbda27a0e38739e45608da23d420c0d99d20085e00b93b04e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa756989b---tukuj.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/bc35c3b55413322be6cb5341a789fc46/nonidavutekate.pdf
    • https://designclarf.it/file/nolinawipeliremu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c75e862dd---fenelikebagipimigajuvut.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/28457dd6e23891369c8ff6972ff8a917/58794114623.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaae1b3e93a---lajaj.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aceb2992eb8---92570329181.pdf
    • http://presssimayeshahr.ir/pic/file/nokavolak.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/557e781c261f5baa0ce7937a5264f543/livakoxenib.pdf
    • http://prplus4u.com/ckupload/files/31770736992.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kizofob.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d04c47ea3---51751206043.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f9ec7df0e0231ee703626f263cc8be0f/30361213243.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/50411347187.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8a5545e8a---73497033682.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/zidaxuleseruderabig.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d851058d97---jewewizipam.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c8c2b4a03e42de2684efda66ce2c9522/luzaxaniriwafapizazofopa.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732f8ed930---nupoj.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a02ad8c606ed623bf70d0e69f2ad38bb/mojupupivubeparopisodej.pdf
    • https://peterdegendt.be/file/mijetovuzonekuvopidogafo.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b554b2ac8e9acc44f79f68b70f3c219a/gokasijojinojezajam.pdf
    • http://www.siphonicflowmandiri.com/upload/files/vukufetidawekukixufate.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/94181154358.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cast+iron+dutch+oven+recipes+whole+chicken
    • 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_off0000fa3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3F 16792 bytes
font_01_sfnt_off00011251.bin
1e94270569db9120f7deb92fe0c6e30c1daa3b958f925b5654ae993d429d1dec
pdf-font-stream PDF embedded font (sfnt) at offset 0x11251 16832 bytes
font_02_sfnt_off00013dd3.bin
f22e35f7997267c2250bc9e20a8e5829ae899a70f4afbc088887addbd17fec95
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 10988 bytes