Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03939735df4b848…

MALICIOUS

PDF

73.9 KB Created: 2021-09-06 17:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 359601310792351017ff1a3296ffa794 SHA-1: 8c793b59f5339eff12ca195aa54450a02ae8f793 SHA-256: f03939735df4b8484348d050d67e05ec4c23f6f9204f5378025fbec07f5e11a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous compromised WordPress sites, many of which host further PDF files. The presence of external URI heuristics and link farm indicators suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted from this sample.

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 https://ketchas.ru/uplcv?utm_term=time+to+the+minute+worksheets+3rd+grade PDF link annotation
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e95bf99cc4---5011017658.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc553fc267b---gufuzifigugowu.pdfIn PDF document text
    • https://led7.ru/file/xobokovo.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718911ea592---tumezagemarikumoxufux.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/85e2f3ef9e266dde346fed8ac0750c0d/71473868515.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a480433b640---21373670619.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/74209110786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e51d2dea4---12608131778.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/77427993473.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608550c858420---zupubukidejumi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778aac2f73---67280618315.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/49785991538.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/69220650927.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/34002990305.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/79687609683.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a392989e776---zosomebijo.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/33682098901.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d8a93ec79---pebigol.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073f3aa1f5fa---67522403775.pdfIn PDF document text
    • https://rotitelor.com/contents/files/wagepefevaresitazar.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161180cec37577---28315090969.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/o339ckiuii5ij76meb7h8395s9/petegamuwejage.pdfIn PDF document text
    • https://digireg.dk/upload/11418999231.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/zevobixuzuzimonafeguwo.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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 16988 bytes
SHA-256: 797573138bf053057eacab24ab38948f59676c7ccfb227ec620c0e9cef150f2d
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 11060 bytes
SHA-256: 423b6ea4e781dcefc3118cbb12e187c3e510580da925f9719a835c57e38d569e
font_02_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.