Malicious PDF — malware analysis report

Static analysis result for SHA-256 15304f3e540c3e3c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 20:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46b93d728d769deb883d5294ec5f028e SHA-1: 390c171b7d419e12b19a8afade0d66a491a081aa SHA-256: 15304f3e540c3e3c1531e2b1f9b4ac0879c28c87beed748873d908082b6d4c3a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links strongly suggests an attempt to lure users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://buyafranchise.org/files/files/70526421134.pdf In PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/99914305582.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2830c5a7e94b357d7607d733ac7cce60/51481417236.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/siwatolupawifukaniwire.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3ebb58dcca17f26fc1eba39ac88629fc/76343922624.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zepidarovonezavabusafepe.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/rebawotanesevadejif.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kositopodipogolejenog.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nogunapewudoguxuv.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/fivuxatufofajofenisepa.pdfIn PDF document text
    • http://primaneighbors.com/userimages/dofibavotud.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/pevaworexonaxupifaxolaf.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/tonifuvuxib.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32145397105.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/rudonalajaridimojabagitir.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/70012090705.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/75816567916.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/tasarevop.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/biwevedi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tipijasojukiwafotomonuma.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210909_040955.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/77468444264.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/penaju.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/rexuxupu.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/zabosupujopud.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/velonitenafiwudinidula.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8aac52f6---29374082769.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/fosodivitom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+reset+developer+optionsPDF 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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 10272 bytes
SHA-256: a9081e2d55d2ba6ea326a8151806c852d278a613dd4404fd92a70d5a69a9558b
font_01_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001077b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077B 17252 bytes
SHA-256: 519de1cd5a93d85b0000a5b4858583397fef12269866b45665aa33cbb88e61e5