Malicious PDF — malware analysis report

Static analysis result for SHA-256 58994c43b505d26c…

MALICIOUS

PDF

103.6 KB Created: 2021-09-24 01:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc3e8de06bed8bfdeeb82c7a287ff2a5 SHA-1: eee1af4f021d53e67228574ed154b6d3426c95b6 SHA-256: 58994c43b505d26c874f40dacd7c4c98b26cf80500d27f01fe9818acdc4c1588
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to potentially compromised websites, some of which host PDF files, suggesting a link farm or distribution mechanism. The presence of heuristics indicating instructions to disable security software and lures for password-protected archives strongly suggests a malicious intent to deceive the user and facilitate malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tcgardening.com/userfiles/file/2021090814583173499.pdf
    • http://entrackintl.com/uploads/90560265288.pdf
    • http://cjmfgx.morefriendship.com/upload/files/87141027711.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16148997e88a3d---81726038500.pdf
    • http://queenart.kr/userData/board/file/48548659598.pdf
    • http://gps-tw.com/CKEdit/upload/files/zerupejijivigapo.pdf
    • https://nnt52.ru/userfiles/file/28646396291.pdf
    • http://tinhdauvietnam.vn/upload/files/pasonakavi.pdf
    • http://radiopoint.cz/userfiles/file/94331736255.pdf
    • http://theemasternetworker.com/ckfinder/userfiles/files/79338490327.pdf
    • https://cissud.it/uploads/ck_editor/files/72349682919.pdf
    • https://matao.ro/app/webroot/files/userfiles/files/jotopejunizoxelefenupo.pdf
    • http://xn--bqrr0jw6bmw2g.com/userfiles/file/1632432219.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/99529903808.pdf
    • http://belean.pl/userfiles/file/48173189246.pdf
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/85262970456.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/bepexewapeto.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f27dc8e5fb---vowesaku.pdf
    • http://keemunblacktea.cn/uploads/file/22141126141.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf8faea7e---munumufaboxafiro.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480b2c3f84b---26298418982.pdf
    • http://geodez.com/pliki/file/60914639926.pdf
    • http://nanouklid.cz/upload/file/danakitajuvuvone.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/75728086064.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+gta+v+highly+compressed+for+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dcc.bin
27de92a69e78260dd6667d5586b9ee72611a23aa2780ed3e5b2e82754b803dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 22000 bytes
font_01_sfnt_off0001473b.bin
e046b153cb20d005ba5c7679681187980b7cfd78bfd4a516d2477afb355c520e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1473B 11336 bytes
font_02_sfnt_off00016195.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16195 16792 bytes
font_03_sfnt_off000179a6.bin
628e76129bce4f8f47a6f113d2a154824728fc21bcadd22353cf464dd8922f9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x179A6 16444 bytes

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