Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35907e9e97f49e9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 08:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efabf1a32a0548cb49aba6d83ea26817 SHA-1: ad9d595e15e4dfa235baecdd23621dcae1b12baf SHA-256: f35907e9e97f49e9b77adf7aaf890257e32b202cfb43885dc6b5fcbf571045df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a phishing or malware distribution attempt. The document's structure as a link farm further supports this, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://globalmediaminds.com/uploads/files/nitego.pdf In PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/1377558544.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/42384151878.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9d6588f0115abe1b28a49ef087b4a5f6/7167239456.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/91623540755.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/fagupizadiri.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/49922222739.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/38388675108.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/2912755983.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/jugozulukogosasixovodobu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902062634.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161372d33e3af9---xigidetuzipifijananuvu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qdltajl8g8u3jsor9q6aej4vb5/46366720364.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/83846593416.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/47741583958.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630893343.pdfIn PDF document text
    • https://aokman-drive.com/d/files/rejogoza.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/rikivanizarog.pdfIn PDF document text
    • https://arerp.kr/data/file///firuzowafaniluxamo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f029fed93eb7d86867f3ea2da8578ddb/74172369989.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/3098078810.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/f0fa5e69e1fe3b2ac44bb8e61e161e96/voxefosamakukiwabib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+dark+mode+for+chromePDF 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_off0000e267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7E 10644 bytes
SHA-256: 689125dd30dac86f7ce40295b827b0cd137b1c1ab1533fb1a571f6e19b7a1c31
font_02_sfnt_off000112ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EF 18156 bytes
SHA-256: 7488c2e98a26115f3568e3b75d1276e40627bba546fef6fff32856bef4e87aa5

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