Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e28687bdecd561…

MALICIOUS

PDF

97.9 KB Created: 2021-09-24 09:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 745b39574bae354be2f29fabd35b17f9 SHA-1: 0e4b0ca58118f9ecd636ba9859d65b081e2172c9 SHA-256: 56e28687bdecd5614af5cc78d99ce4a1c22447f8ecdbfea9ac3afa645016fdb9
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV detection and ML classification further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=how+to+control+your+phone+with+voice PDF link annotation
    • http://vet-spb.com/userfiles/file/mozefamusupeveno.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/lejokenixunidege.pdfIn PDF document text
    • http://superazs.ru/images/news/file/87927431106.pdfIn PDF document text
    • http://laduses.nl/image/file/7056869772.pdfIn PDF document text
    • https://breedlife.com/upload/files/95367374607.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1691c81118df658d0cab1cf74107fc25/23078290483.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/vorunopenixa.pdfIn PDF document text
    • http://abnicum.com/files/file/87928685706.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/73747974886.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b83db8947---55710653139.pdfIn PDF document text
    • http://195exim.com/datas/files/59783726287.pdfIn PDF document text
    • http://hjhchem.com/upload/files/92038860292.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/zebugodapufiposorimosegu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/95791241721.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/timopemixexaxasuw.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/zujajog.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vijik.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614196d496d83---bodadarodapusaxegoz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7498a21f08e3cc20d38c8c3544045181/jevevagebenumusopaxemumo.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/povirimav.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/14442806797.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021092119034273499.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/87912206553.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_off0001194a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10496 bytes
SHA-256: 64451f9016c78bbfbdd2db14f503f6ac67e57d0ed8a05015ecd8b9094d1f701b
font_02_sfnt_off0001492a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1492A 18956 bytes
SHA-256: bbf25a14a1ab992940c85a8312ca1da421cd515776525096b24eff88e521d1ef

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