Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d26893ce22e48d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-07 00:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c99e2c1bea518c75b8ad580067766a0 SHA-1: bab69cca51717d9defc3d00636ed32ae05f44ab3 SHA-256: 79d26893ce22e48d482275a4f63f24ad9f6127514f3afba5ea727cce81b1f5da
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to malicious websites. The presence of compromised CMS upload links and disposable hosting further indicates a phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=writing+prompts+for+elementary+school+pdf PDF link annotation
    • http://dallapietamarchisio.it/userfiles/files/74095091235.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/jijipeviwotawimexat.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/37938260927.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958791ab177---19029490103.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/jitefolilukew.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112f3c761d4a---63989352390.pdfIn PDF document text
    • https://777mto.info/contents//files/98127691009.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lls4ouofmleikcvhj2iqi6r297/gigijuf.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/96541903585.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/lokobudok.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/tevediwesule.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/r5bqhio2hjjkmrn6cunpfcnm20/wikufatosure.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/21013697572.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/lodugarinaxarafasuzupuvop.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/livutape.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909966e804d---dokenugofobebuzepegixa.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/71951269850.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/xasitonox.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/94aaa3f8789b8871a647828f4c07e5f6/jafubawi.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/573666770.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c6af01fb---13681795515.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/vimoru.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/11200875153.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f502a3c2381---51892508689.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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 17344 bytes
SHA-256: 9886bfd523ed12f86a61cb98bec15d0bd085783a225c80bd9a15a1d4b34e9fc0
font_01_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 11176 bytes
SHA-256: 72460449df97cac535815c3601ad771cc2308e197e7811c23c9095688aca13dc
font_02_sfnt_off0001397c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1