Malicious PDF — malware analysis report

Static analysis result for SHA-256 825f4ccd6c2eb935…

MALICIOUS

PDF

99.4 KB Created: 2021-08-24 06:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5f8bc2ec28a68d730df2d303d0efb033 SHA-1: e9b10f02d69f20b3354df92a90dbf5dda24fa5f4 SHA-256: 825f4ccd6c2eb93535cff6d4ff4c85251b3dbd19e26942aacb047cd9fe2e55ce
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs a social-engineering lure, instructing the user to install a browser extension or update, which is a common method for distributing malware or stealing credentials. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/slrulnh9our723dl3tp62tebc1/45688729357.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/8veespj32ne2p5p36htnlb8gog/88760899051.pdfIn PDF document text
    • http://boldogelet.hu/media/disipegeva.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ha978rvvujcfgoktqbauruja7a/sirizusisuxeg.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160728372b36ec---48096519742.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/34605309925.pdfIn PDF document text
    • http://airfa.it/userfiles/file/jijawamew.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/43410602807.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/27794820515.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/8adb023bff0d96216ad05033b9b8eda7/redaxu.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/pijedesadip.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210710181039_tuj821.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/9kkaprmtadvjd60d0libqvuvr5/zesegowod.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/19332087259.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c940a769e72---xitadovowufirubagunujil.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd935b6e46---99687084874.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/16773741929.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/viramixene.pdfIn PDF document text
    • https://subarini.ro/mm/file/2710469056.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/divak.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tiwowozuvapedi.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/26313535354.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb279d0ad---maguribib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ada+coin+stakingPDF 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_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 17288 bytes
SHA-256: f9d8f719f1d5407d3ccd670ab0895a8a008649f0151b9c1d795be63c21f10342
font_01_sfnt_off00015049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16860 10340 bytes
SHA-256: c0c11ce7440b8485e925fe506d8e4af1bdad745f5d595b27047d04a259190ad6

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