Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e15e36baaae5f3…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 22:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e721638a793f1c00540ced7316b9bae1 SHA-1: 4839b42427ca2ba8a54af05ce6cec95e95db8b76 SHA-256: c5e15e36baaae5f3229411795b0dc142667d9d4b20e8d8093b3a707bc799bbca
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious or phishing content. The presence of many distinct hosts and the use of 'utm_term' parameters indicate a potential SEO manipulation or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://baigeleather.com/userfiles/file/xewovarogimizopax.pdf In PDF document text
    • https://fontaine-eva.fr/userfiles/files/97136437177.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/xotofaxefom.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f294364f0aa808cccb1d099950626f76/71998773517.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/292d5d0fbbffa2da00f6adad31e9d67a/25881251177.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/remiwetamibebesaniwor.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/44905402826.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210614012305.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27e450b50---topeb.pdfIn PDF document text
    • http://cutskytools.com/d/files/vazuvoza.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124cdfa0e441---davup.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/89411883368.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/merewi.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eb07062887601f041cf3ab068e38226a/40281284953.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/japafitaxofamitokipopi.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/730sgcdakue71nespgp75bsmtc/kevaroxapoxobinir.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/vavesemunibaxutevidapuzi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb32e5307f---nilofu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/84448689986.pdfIn PDF document text
    • http://seritour.com/rsm/files/texivop.pdfIn PDF document text
    • http://fitviewer.biz/files/file/funulenomasejigefipasidif.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/07d7c1546bdf6d240eadb33479ccf5dc/pegofotulebutirirepe.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lepipipekub.pdfIn PDF document text
    • https://bursac.net/userfiles/file/zimoralakakutavu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062feed3064---fekijinosijuwal.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jblv3revopcs6bsqmsvbmdjcjv/vemas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=4+stroke+internal+combustion+engine+pdfPDF 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_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 11276 bytes
SHA-256: 64ce51ab1feb699b25ac2be64030d2b647124390d5a4734c7af9ffcb8efc63c3
font_02_sfnt_off00013c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C79 17904 bytes
SHA-256: f510d4bc98c8c8c2092c12168fd3d8faeb8a22ae5cd7f55d3d52083bc5da66e4

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