Malicious PDF — malware analysis report

Static analysis result for SHA-256 15364cc3ef35457a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 08:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41a6d1006af2e34a4785d55d0fd2825d SHA-1: 12c97559516ba91f12fda7cd7a1f34e36b31d2ac SHA-256: 15364cc3ef35457a0e5de7acf3219890eab386c0902a405b63a65f43f760f878
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack pattern involves directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=tarot+divination+pdf PDF link annotation
    • http://seanmore.com/userData/board/file/lesoxunepava.pdfIn PDF document text
    • https://akemi.ro/hirek/file/zugebi.pdfIn PDF document text
    • https://phr4u.com/files/virapaj.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/tebege.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/rafogezetevogurodopuz.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3086a489---11122333556.pdfIn PDF document text
    • http://richfieldhighschool1969.com/clients/868116/File/2944816430.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160941eaa3f7d9---86384796328.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8cd0ce32d---binowuvubilebi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/kerukivifaz.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/8360463982.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb2a1ab6f3---gixopedu.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/81117489367.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/21884608633.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88567323148.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/nodakagerogidu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816921a9ab---dulopiwogowogabi.pdfIn PDF document text
    • https://music-group-store.com/upload/files/sofexukuzibuzo.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/nuluruleb.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/46064299327.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/54985457271.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//garerinusuzatofo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c424e160757---74538485337.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/sogagajidodigosepejagug.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/93453406011.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_off0000e46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46E 10172 bytes
SHA-256: ffb64282d25bc824ff035ec07d0b4a05a5ac2b547225f45d623a0bda0a7de60b
font_01_sfnt_off0000fb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001135f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135F 18696 bytes
SHA-256: 514fbb7beedd7f5e88ee37fa82ea44f51639cfe7988dffa639425664a5b581bf

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