Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f08336df902769f…

MALICIOUS

PDF

87.6 KB Created: 2021-09-09 08:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc022aa3f60b62d733d73757035438ba SHA-1: 175205a6a0b56622a2f28acb93afae34a6fdcee7 SHA-256: 5f08336df902769f313b63aa5d972946aa299e136891d48bc6c106d012a65a7b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating it's a password-protected archive lure. The presence of multiple links to potentially compromised CMS uploads and disposable hosting suggests an attempt to distribute malicious content. Although no scripts were directly extracted, the PDF structure and associated URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://khodahoanglang.com/admin/webroot/upload/image/files/ratuwasusafivoxuke.pdf In PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/05/18943703487.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/9o59mkuqere2lmeh4mdbmcb7a2/23078396825.pdfIn PDF document text
    • https://kildevangen.dk/files/vuxibadime.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/puturonepunaxuromesu.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/84312249965.pdfIn PDF document text
    • http://cristalensi.com/public/File/51711267773.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/fofitowojiwojevon.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210904151132_1932303723.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/01/24417615973.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/kuwatekikegipetiparedi.pdfIn PDF document text
    • https://computerzone.pk/file/wobetijojano.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/dawunoluxapobajifisazeda.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/fuziniwoxolibi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138aff752ecc---perepanelotakubemexosari.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/69141227889.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/78971733508.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/zuzogelevufusun.pdfIn PDF document text
    • http://hotechike.com/files/files/23929613485.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396e29a1373---84027394423.pdfIn PDF document text
    • https://nls.vn/upload/files/gavifoxejapukanu.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901104515257586.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/93694991020.pdfIn PDF document text
    • https://olterus.net/contents/files/9902568763.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/gijakepovaritisosazis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=save+file+for+gta+san+andreas+androidPDF 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_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10672 bytes
SHA-256: bd184752e96c6e6c365ed11c6cddc5642b1fa1194633b1cef49951bcbed155cf
font_01_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 19344 bytes
SHA-256: 7eee954f46edfa4cc049baa560bcc7d3de7f8a453d4b7ce552ad4bc5472bb475
font_02_sfnt_off000138f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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