Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f0d8c9cd80821dc…

MALICIOUS

PDF

77.2 KB Created: 2021-07-18 01:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76054dd370c7d4e28def9c8ad0b2083f SHA-1: eb62ce8fd4d33624ec06915dc2a5209ffd434a60 SHA-256: 3f0d8c9cd80821dc490a0a2566d4f5b6a2fae4a207b2ba0d99ddf84115f4cec7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV and an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

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 https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/v28ft9cth7uh23ehmotgurvbno/49383602734.pdf In PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b515b3a6c---xuvogobevoxageduwiremo.pdfIn PDF document text
    • http://insureacompany.com/userfiles/file/nivowajibozafeku.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/wuramutomakagamifujodaku.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/r5br64pgualcpg0e4181acbdik/luwiwinabuwoxoluwim.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5039fd3300e46a0de0817ff83e804103/tidakuf.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0fb504111---14646527469.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e80064852b8---sasobuzavukukip.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/92230088646.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/88q12e6ng0rse485sr8icj6v07/7312616768.pdfIn PDF document text
    • https://masihpt2.com/contents//files/6074284393.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/66548321866.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1087e1cc422f900840ee65a66d38fdb4/radosek.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b98490h61p3o7qt0ep7kin7qh5/sevipajovowefevovujagamoz.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/77740151015.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ed1a505f---lesokatezavojaboxuxomeko.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be382e0808---gupojunimaxinanen.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/29dd3a3a3d14d40edea7a5d7c9b7da37/ladameb.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/zigurodekuberivisegi.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/sakebigozikogajataz.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5b22721e4db07f4bfb2868ec32af6721/fegedokemilomageliliso.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/99694580658.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/givufizoxetajujilurafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ano+ang+actual+gnpPDF 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_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 17048 bytes
SHA-256: 73daae0ef17cc9572f926ff68807d14306277c597687670591d01b40cef07005
font_01_sfnt_off0000f8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BD 10140 bytes
SHA-256: 552856d7eccb106da47f63abee1aa68695dd41e6a8fc3c2bda97697550ad29db
font_02_sfnt_off00010f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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