Malicious PDF — malware analysis report

Static analysis result for SHA-256 9835318c390bec5a…

MALICIOUS

PDF

85.2 KB Created: 2021-07-18 04:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f95e742793e16e9b71e5b20205d210e SHA-1: 66688f2f039951426609c27de13f0750d7ff31f4 SHA-256: 9835318c390bec5aa81efe7e72321e44d0bca69b70b123477f8d4bd8059255b2
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links to potentially deliver further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094503a97aaa---62031443961.pdf In PDF document text
    • http://dd-eng.com/files/files/xikikimipikunovegugi.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4f92cd99e33edcdb74e6975f3a07e1b7/suvisamiwagixopovuzesu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7e65a0c848b86b28a6eb0b29a1e5880f/wofisiro.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f3a4e2b2d---63591542121.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3ujl14bs8815vjqu51tivftbmh/rejivomejakopuripo.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210710190651.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/fikakobejor.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608833dd76841---86492697408.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/sisonaxamo.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/dogaxatajujotuz.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160948ddbb87ae---lekewowogaputilil.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4a55b6aa68d63d7237a0a491ffd84b7b/58408336847.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b3982a72622f8a1e62cb152b7ed64aaf/witogadag.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/61voreggs364j3qpk4mkauls2c/kebisije.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/las5vf1iutc8hejmir35e44pag/61238184778.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14361805e---fozamubuxiw.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d57b58eb1800a2e9e6e2aedd631efef0/83006880092.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/10607513565.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/rewusiserazesiruzivap.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/00bee76d9f61b7db6f2c04f2dd441946/91388811784.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/gejusidedowonetatu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/b041142e38u7fcoge31vtf3rcs/xanekisizigeli.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076788234a92---vojeligo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/89055987057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+length+of+body+tube+of+compound+microscope+isPDF 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_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16232 bytes
SHA-256: 2e5f3cc3ce8e4c3c284fac7dc57fbdd57603f9717b09a41245791beb8de44326
font_01_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB0 11220 bytes
SHA-256: 21d2eacf30bf8fb15956086648c691f47ac36024a90265a54eb2c3f5bf95e206