Malicious PDF — malware analysis report

Static analysis result for SHA-256 10533bb5adc04387…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 03:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d430cc3651f31bdc123b193d39798ddc SHA-1: ecaaec13014d709223ee40e29119ff41a7d86db4 SHA-256: 10533bb5adc043874fbeece0566681d076d0540ce6202eb8b26a8a482082ba5b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mrcubezpieczenia.pl/app/webroot/media/files/21983367181.pdf In PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/49091168074.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/63491593853.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/67b3a78f154a5b31da20e6e546fc58c5/pabemonasarafum.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/4311313785.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/72493982877.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdfIn PDF document text
    • https://phukienbep.net/media/files/malureduxubexox.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/kipemakuvopunorofuba.pdfIn PDF document text
    • http://rld-carbon.ru/file/gotegobidisusotomatej.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/duwefidedifafofube.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6886db26---bugomumagafafinuvi.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/21740145537.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/sukuzuxi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c98dadf857a3cf255aa2f5aae90c759a/jimuwezore.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d045a1df2---mipexakafavomu.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/zuwikunexiragof.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e34dc83a390987b712c0f5a313620bda/bupuxugi.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/ronaruro.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c8151e034ad602fdd67937a89c8bf805/wofagulala.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1baa44c2f72821adbd0e44730a52ccd/96365587976.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/20779153528.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/51810570503.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/mubivadalabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ufo+vpn+basic+free+apk+downloadPDF 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_off0000b9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20D 10904 bytes
SHA-256: eb1c2506903acc5c5561e56e4641c58e5fbd53b66d5e7d9f89e45b6c2d175949
font_02_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 17180 bytes
SHA-256: 8fcfc85ef7d51712e3b520634ab935bf5a2dc78fd8752c639cbd91a3a40a6e84

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