Malicious PDF — malware analysis report

Static analysis result for SHA-256 da998d7665bde28f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 02:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5bd2c579246f9193b04fcc6aefec9f8e SHA-1: dbc81c7726ac324da93012b412d308f6b2e281aa SHA-256: da998d7665bde28f6471842f9be5f349cee427599f931880eb81166a95c201b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL targets are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930cbbf1a34---75535121013.pdf In PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/ed8a2ba477d78a88fa7ac8b99f8ba936/68725308759.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/wasezake.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/93411511319.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/1512430186.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/78051910922.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/80777998146.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/buzodowegefin.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/javojimalasodajinod.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/rirapevujafibogamaxokix.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/57515799180.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/69886435822.pdfIn PDF document text
    • https://basisnomor.com/contents//files/28588681429.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/koxesibozusux.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21233714d5---dogosadefibebeve.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/bunapepigufoliku.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/solexugigib.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/lipofefenetuguvazip.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/baxupexivek.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/2329445756.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/51197020160a9b516b5d79.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/jejezirovifozupad.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nawumoranoxomuvumabag.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/44490483549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=verb+patterns+worksheetsPDF 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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 18036 bytes
SHA-256: e918ef9c0cdf5f91938141fd70305719d661441773bf2afc83d3220f23b526f1
font_02_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 10496 bytes
SHA-256: 071d47b8b7fd5867e88ca927a37c0b1a15638a09e517f8105058595124bdee97

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