Malicious PDF — malware analysis report

Static analysis result for SHA-256 7887a80bfca4f715…

MALICIOUS

PDF

79.8 KB Created: 2021-08-08 11:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64df79a266ddc6f2737727aa09359fc9 SHA-1: a23d251385d44a7bd4387ee4361797f5f6b7a734 SHA-256: 7887a80bfca4f71506a7cee1438e958f5bc76803fe92c72f34fcabf5355c24bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The ML classifier strongly indicated maliciousness, and the presence of numerous links on potentially compromised CMS uploads suggests an attempt to distribute malicious content or redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://posekatzahradu.cz/files/file/72962559738.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e85f735c272b42540186dbd2204be504/84060518633.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/54136987034.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb37b9e5e---bavinopasawo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b774e16979---92467320959.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceae5038a4---lexodeveforozadukududadow.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/23206934707.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/83352747515.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/7a866df9dcabcc61491dc52a7d8fb273/48274727349.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fugitibovudujilokiv.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608633c683105---lodutidavamavowot.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806aff09dd3---lijitirurew.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2b7b37a8---48881043564.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/jotitezudefavejez.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/90525342557.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/3df947a8007f45a3c6f1f78e5ae567b2/migoratup.pdfIn PDF document text
    • http://garderoba.sk/images/_file/25784223961.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c326d8155649dffefa2a060dc31861/36097966509.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a87d7d465ba438996563831e84ccbafc/47787580640.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/dipezesubafa.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/nh2i1v9hsh1ip4100qd31f2ur1/5046065880.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/bumiwegejabijewon.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/mefaxumobatokebix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fts+2020+mod+apk+androidPDF 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_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16984 bytes
SHA-256: fe3b188073698141a37695357813f7a792271d96f7e6e5d03daa9689b434b592
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 10688 bytes
SHA-256: 180ca014022da38eb45e771bb8e1f1f5bc4babea2b94fe7d0bb5ef55fcc22aba
font_02_sfnt_off00011952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1