Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fa7d4608d9e134…

MALICIOUS

PDF

87.9 KB Created: 2021-08-23 09:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3462cce05a7a31eef6e14b4efe828bc7 SHA-1: 20f19704bfc56ee0c2813cdbaf97c5dfac531a8f SHA-256: 22fa7d4608d9e13426b1dc46bc039c083e9c8ad1eac6950a80f42f3475c5437c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=south+of+france+style PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160effef1dcab2---73369622627.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/bavomeberitaleb.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/872e6d91d1ac161084e701998c756068/kavufanefolopifuvadaxiwo.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wutonawopinelizeri.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608616d707c92---livubomav.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f7fd8db02a185582b7773a1ee87c5983/nekapabixidusisabo.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/11119527723.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16117e84aa190a---lisexabadikolobinepigaz.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fdba7d1eba31fce7597b531ddda6c1bd/ladepusijabupetazos.pdfIn PDF document text
    • http://svx.su/ffile/file/latitixudevuzag.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vamubiluvob.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/211022557357.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/kesovolovosodujuvalu.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/1900748354.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/edc497e0faba21c5e0f007f9d463ac34/piroj.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6915418b9---kevenumap.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4p1bdk213th102q2d2l3k8ipb6/83960337357.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/65660749758.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/9138521a492f98a000cc3a2e337e5216/21894482393.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/dolumipijinuduwixovola.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c708ebb0fa---mifedig.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/f2m49prljbon5p7fd22a2qe57k/kugogafomuxo.pdfIn PDF document text
    • 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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10632 bytes
SHA-256: 576d2941003454ec02a1e63db9d95bd01feee6133451f5696a026a82c310d7fc
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 18100 bytes
SHA-256: 9afa9d12bfbed210e5de2586d90a141f72fd5cdcbc1fb7c895d5b1f0f8c65800

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