Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfac96f44c78748…

MALICIOUS

PDF

93.6 KB Created: 2021-08-06 05:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 970e5c3d045bf0e19fc0767582508943 SHA-1: 48e230cc448f422754ac5adaf9fc5df745b37369 SHA-256: 7cfac96f44c78748426fa480dec1159215ba996e89ba2aba245255919c821998
156 Risk Score

Malware Insights

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

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 external PDF files hosted on various domains, some of which appear to be compromised. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://kingcraftviet.com/uploads/ckfinder/files/52276267389.pdf In PDF document text
    • http://quangcaosms.org/media/ftp/file/zajokanolapise.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gupelefef.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/90702158348.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/a131fa287ac19ef5c8b0b11552ff9ad8/kedegelibotawir.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40801507224.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/87389825573.pdfIn PDF document text
    • https://dacola.com/upload/files/51731959844.pdfIn PDF document text
    • http://htwy.com/upload/file/toremowibomajodawiminuxa.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8a1567d0864b515a78804c3a7ece079c/49557362291.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30b16d372---gutafizos.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609666e4e97b6---88852473808.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ksh5plm62jh9b49rtpotkg1c5/bejigofogebixif.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/7775533587.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/31ac654a6b568fb5cc68b0f245cbd605/63429007283.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/kutireberip.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608350ef620af---bitowipe.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/bddaf3ac88e3b6fe963ed0dcefa154df/88165287598.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zorabas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7955c11ad6---walerulerazufi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373b337df9---kekage.pdfIn PDF document text
    • https://shidoremicrosys.com/media/peginuvumufabi.pdfIn PDF document text
    • https://avela.md/userfiles/file/migojalu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/47d64a08f4c908930a5b7697c5b279b7/waselarusujobu.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608502f88e3db---75283023039.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/wilopiwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+you+mine+bitcoin+on+android+phonePDF link annotation
    • 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_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 17844 bytes
SHA-256: d3718ecd8269eae88a2482c99536166a44f13a62f516f719a8abe1030c3178bc
font_02_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 10952 bytes
SHA-256: 7403932bc860e7722937afa353be35ee0e3081c1e39a82e0c353d7b95b3a58d6

Open this report in the interactive analyzer, or submit your own file for analysis.