Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7032ef898ac9f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 00:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7de3f2d7024dc6d94e568c00bb06a4d7 SHA-1: d396b1c396dc637b8501844f6c0ee49dfc4fd1e7 SHA-256: db7032ef898ac9f29d5e9336fc829003ce3f9348f57e16475ed3d9878b737f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature are common in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=words+that+begin+with+the+letter+s PDF link annotation
    • https://dodatnojamstvo.com/userfiles/file/37975773086.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/tabeta.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/wirarajibawotom.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/numet.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/vozadun.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c985fc97c4---1164301220.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/9613118522.pdfIn PDF document text
    • http://banquat.com/userfiles/files/23785971196.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/topupoza.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/vupigibuzajan.pdfIn PDF document text
    • http://umhouses.com/uploads/files/34008350343.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/porikazomuwuzegaf.pdfIn PDF document text
    • http://iucecb.com/files/file/lubuludekab.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/40540392479.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135427b1bd4a---61024268842.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141f43fb9654---46266994790.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/84157195984.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/23202058093.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ae3c75cb086557d685db1e8e3fa8f17b/10532804244.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/417605185613a9e76d9de1.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210907081638.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/10770682211.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/xetoful.pdfIn PDF document text
    • 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 18328 bytes
SHA-256: 202597e44bec90eb1fcfcdbb457d65c7f0f0273dfa8c1178de788a3084c8d62a
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10744 bytes
SHA-256: 2fe79bf45426d944f285ab8f325c50cc184775160be1cf505963e2149cc5972c

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