Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b26580973b261df…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 07:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27169eadb29a811d5507a28f283e3055 SHA-1: cf505b55911ace3cbcd0e9ec2f7feea0f7db8986 SHA-256: 2b26580973b261dff6352e40a7f34240eafe5c880d6436eefcce7d685f84ce34
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. The presence of a download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femudodafisulumokofikive.pdf In PDF document text
    • http://worldwidestationeryholdings.com/files/file/vidazijewujami.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vizifukaf.pdfIn PDF document text
    • http://sksound.com/userfiles/file/vixutorikobebakipezeb.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/maqmbrksdgk77k228d8egbnbcj/soxozi.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/80921940762.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xexawowiwurusasopaval.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/82484291398.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/woruwofajusawejabale.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/8276508900.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/77058772469.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145535b59c98---66604463654.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/73746012180.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/85836178674.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/41108295040.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/nalive.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/84112773861.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/puloweturopamipu.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/zevudefutali.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/1669478314.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ffrnmi4sic3e2b1b44ao10o31/texinizene.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zogasuxerupuxanivetigafam.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zesor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=three+letter+words+starting+with+a+for+kindergartenPDF 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_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 10776 bytes
SHA-256: bead762bbae86674fd26d3d38285663e60d85dc3c773cee3ffb19464bbe139d6
font_01_sfnt_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 18100 bytes
SHA-256: 322ec15dadac03b07d0c2d2b280ce314fc02934fa01e8f0021c2ce1ea2cd0153
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1