Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8b50bcd0e0805b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-21 18:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4fabf2911fb8f78d2b547033d20e8dfb SHA-1: a176f8649da062842839083b561de20cf079a1a7 SHA-256: eb8b50bcd0e0805bacd1402e3d2979cd0cc88944b734fbc711785a66f2fc3c07
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dooroc.com/tk/upload/file/logivebudosikupuluxa.pdf In PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/jijowimuripumuni.pdfIn PDF document text
    • http://e-district.org/userfiles/file/28101214103.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/14404346070.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/dukolaxazekosodejel.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/85778918476.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/19152251426.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb09cee1a6---2645126640.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/36085284719.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sisilezuvonugogudufagasow.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/10494577581.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/zokozizumow.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6f3921221---sofigelodarepofajabunaje.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/18283010478.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/81574076850.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/fapizafirixu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613470d4d72be---38370468948.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/wozoxezifasekomapog.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tegoguvipenowefobuz.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/jovasipipawagiweduxosiju.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/savuvunom.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/69962214970.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tubogupob.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/51559187735.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/bazilizijixos.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/vafisufovobavuporawile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=monster+fishing+mod+apkPDF 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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 10984 bytes
SHA-256: 3a55c44bebdaac3ebf81fc05a8c7f0ff55970550271e711992445f8e0b96b775
font_01_sfnt_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 15336 bytes
SHA-256: 0f35b77c7fd15d982bef2ed8dc2376197552b49e8c3c397ee1ef82759c99e7c4
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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