Malicious PDF — malware analysis report

Static analysis result for SHA-256 24394f8f5d1e346a…

MALICIOUS

PDF

92.9 KB Created: 2021-07-06 12:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: fd6ac6bd140387b5e6dd612de4de4cfe SHA-1: ab4ec95e69a0eea8ecd9c10bbd3ccfb4d3ebf37c SHA-256: 24394f8f5d1e346ae48c5ff5ee7ed1038cd88e5d91979f199999415e4a49301b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/5a1971558af72a53479d3396dccc5cdf/guxurute.pdf In PDF document text
    • http://3q1p.com/upload/file/2106162052139628765g3fnbtipp7s.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/onq5cqhj88l0hruhff116kiu82/71019063646.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/tiluwogimurino.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/55593909309.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/newalezikezuruw.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/lutudab.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2cc8499a2---banubokajazejosorapigevog.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nevufaxixiretepinupep.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/batozelugogiduxigatoduxaz.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/42504239697.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/557830315.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d0aa7c1b0b6---zaxavamosejusax.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/63689171717.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/51267754031.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/pagixetufovinalaf.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2j678mm7sbl2bujnf46qlpknl/95117924156.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/28468647071.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c0b300e9572430ea86d8ff28b7a436d7/33338327346.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc9ca922d---21139914767.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be00199f11a---77041118388.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/42326914650.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/74988666444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tomb+raider+2+for+androidPDF 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_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10428 bytes
SHA-256: b052c20fbea905c52807af8897581690aec92e211943cc40ea414da9e50b4a23
font_02_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 24880 bytes
SHA-256: b3a7ef95ca62539d92f3d56b7640cd91ceae6c36dcb343cbaf45fd72825ae5b9

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