Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc24eee8378d047…

MALICIOUS

PDF

95.6 KB Created: 2021-07-29 23:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9717a4d03fd45f0ac599da9afccbcbf0 SHA-1: ffab79fa3a459161a7e51811a38032ad17669025 SHA-256: 5fc24eee8378d04753e82522c3351ff371be43f640363cbb5ad37e68408f9155
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2204a55f9---susovediw.pdf In PDF document text
    • https://pasarantogel2.com/contents//files/40394129145.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ttsf2jc13j0v7iir8lukik7m12/81587977002.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7640b64041e5e18ef3112487f745fd0e/84241752776.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/5ecb60d377c7a543d98ff6624709fd7c/54206494151.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb108752fa---favuxogafirawef.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4bb0cd51d---mezinokefopifavijumel.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/lclv5fu3l0ibk91kk1abnqov91/11970217811.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c792235f2---nagijefovuxapuneduxobe.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/nesotawofubelikurizepesi.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/bepojazekewigewin.pdfIn PDF document text
    • http://alptw.com/images/files/95742123439.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/nbkievdn4kvmul32ei2hq09ct9/ripenunolitafir.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd60735da4e---wuvikig.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/sukarajevelomafotorilako.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/88376808338.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e473f3a8---bimifora.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d269d87693---69314048032.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/d423b0cf2c0f46d0e70bf70f7a1f1332/94006747917.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c328bb8a45---50111208961.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a358349730c---85654575118.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/nasedakutokidagup.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/069c3016e74c2cd5f876f39ae2497251/gobijuwaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=weather+and+seasons+worksheets+for+grade+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 17352 bytes
SHA-256: 24a109e6faec71dacb800baa4c02a91a2b50bca32daeca89927a74a553bb64ea
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 18216 bytes
SHA-256: 9aad504270550c2d4030e31b0942078af0fac9100546c91b4936097f187576df
font_02_sfnt_off00013c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000154a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A5 10836 bytes
SHA-256: 950c3a28c4cb27cb3be7b805bb33ba55251693acb02a8c3489d3d1baeae8fa49

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