Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e2aee9471389f1…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 03:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49c42f53e49fc209c6b39c87ef960470 SHA-1: 0a566d7f450cfbe96a5e228e87c653230c1010a0 SHA-256: 53e2aee9471389f10ca4025d316cfb50fdaaf70113a3dfa9babb08bd8300f2c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

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 http://hndgyl.com/v15/Upload/file/20219101834329602.pdf
    • http://poslovniimenik.net/firme_data/files/xufirekuzuwavirevupuzono.pdf
    • https://lexconsulting.ro/webroot/files/media/84383427650.pdf
    • http://sevimticaret.net/userfiles/file/jagadekuxen.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/menerumewepizezukiza.pdf
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/42130081176.pdf
    • http://4darchitecture.org/img/all/63955354622.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/34141182119.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144824344b06---34063668874.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613602c86d2d5---69393640225.pdf
    • http://shengyaweb.com/uploadfile/file/2021091521482118.pdf
    • http://e-motyle.natura2000.pl/imgturysta/files/16970401003.pdf
    • https://chmelo.hu/sites/default/files/file/gufebuxifiru.pdf
    • http://businessvaluationapp.com/fck_files/file/64700467965.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613745ccadee4---87473056738.pdf
    • http://pandoraecza.com/genelresimler/file/64815606784.pdf
    • http://gusanhightec.com/userData/board/file/45021887495.pdf
    • https://ateliersmq.com/pevron/www/img/file/rolafazexef.pdf
    • https://highrise.pl/file/wofanidobuxaxevo.pdf
    • https://airxps.com/userfiles/files/xupeduv.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/54461968046.pdf
    • http://epoxidice.ro/mm/file/59331081130.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132487001b7f---jugosugovu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/219954f92dd0f027c6439e5cb012e93e/91107721842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=animasi+android+keren
    • 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_off0000d5f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16792 bytes
font_01_sfnt_off0000ee0a.bin
95272a2d9d862b54d68e1b7a70961b21a40bc55e4203e6716d0a3eba9c9ed0df
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 17336 bytes
font_02_sfnt_off00011ab0.bin
ab8c87e157f9ffa36512a37a6cb30d0307e37cf595d827c42e879897c438ac2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 10336 bytes