Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aa00fba3d8150b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 08:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c837e9c16dd530719eda536dedc8a662 SHA-1: 28160bfd296733398c596668aea5459f1e353229 SHA-256: d8aa00fba3d8150b48c196994616fd6f0329e507466f1d0cee1c38eb825deac6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=cognitive+domain+verbs+list PDF link annotation
    • http://profil-metall.de/content/uploads/file/97391560932.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37044143143.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/57085697456.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/36175713048.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/12454121038.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/10831414402.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/jesabolota.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161351f723b01e---polorimagurod.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/17178557304.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/60118610112.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e688cc18d41f04dcf3539517c14b369d/juwudupekojawixuturimuse.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/160416224108.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/68631113774.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/womozabelomipos.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210921134920.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/73447771377.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/50178026575.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pirujufisek.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/gilunejuvelawepugezijo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c987af5af52fc9b2b399da0e85ae14d4/83223089827.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/dazikovazedalabojused.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/58175590595.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/40331677664.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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 10828 bytes
SHA-256: 14e549baa2b882a57bbef88d7684ab068611c4a63f39795015c3f479082aef89
font_01_sfnt_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 17312 bytes
SHA-256: cf3cf74dbc269230b6bd74f81a63291425f6c61fc2f88fd9f0db9cc7ee331c4c
font_02_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1