Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0ab5ccb2e404ab…

MALICIOUS

PDF

80.6 KB Created: 2021-10-05 03:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2439fd6c79c465075ee597564adf4026 SHA-1: 9ccc0e63e8f6038f1d610ef10caf3a55db039694 SHA-256: db0ab5ccb2e404ab859262202e7c80a1b3a37e7bda8f62759c673c9bc35cd319
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7791nhajhvonaq9vac6ifrcru0/mumopobikusinufinizeji.pdf In PDF document text
    • http://futimisdev.com/userfiles/file/sejegorujaw.pdfIn PDF document text
    • http://czminghe.com/upload/files/taxeb.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/22935432716.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/poxenenadixozikexu.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/pupoxaganoda.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/65819221462.pdfIn PDF document text
    • http://kalikraft.com/images/file/98954698886.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/masapo.pdfIn PDF document text
    • http://analhospital.net/file/files/rimuma.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df26ed4922---dubazisititeji.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/sodasamekedibepuwabis.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/222f965e55eb53340c8fa7a948265baf/vewijul.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/87352171272.pdfIn PDF document text
    • http://citranco.com/users/files/26769666311.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/buwepa.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/pizolalokadeva.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/97815108935.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/duwetimapip.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/momupofegof.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kalopuladuso.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/66393506980.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=perpendicular+line+that+passes+through+pointPDF 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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 10896 bytes
SHA-256: 634527f41b0c99159e0fa2f9763556d97180319b2ef23b2cd8573e41eb6d9f63
font_02_sfnt_off00010147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10147 19272 bytes
SHA-256: a7ec4a8931bc6e34a488c431b01f7f90e91e7e42e983c78bc9d521c34021e8d3