Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0d53dd526307df…

MALICIOUS

PDF

86.3 KB Created: 2021-07-30 05:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b66f4940c4e39fd5ae02f72a6474a281 SHA-1: 668f8cd06f866cb8de4f7b3ca3271c946bb28bce SHA-256: de0d53dd526307df342010ba247624463bc4027fb3681af7d3123ef8f0e02938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The PDF structure and embedded links suggest it's designed to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087113bceb87---wisanirudewezabusepos.pdf
    • http://anhopphat.com/uploads/files/gejededinoruruwotivuja.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f29e7e80859961e3fb2dc79bb0bf27e1/neluxonikapidijomowava.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee51ab3711---79453921321.pdf
    • http://s-moonlight.com/CKEdit/upload/files/mixudobebaxa.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609768fcbab94---33640664436.pdf
    • https://ajitcoatings.com/uploads/luzanisilinenofusoneruz.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/31474816090.pdf
    • http://huimao.com/upload/11765041454.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b3a164ef0---72291915729.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/46261842217.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/57477711838.pdf
    • https://egf.tw/test2/images/file/19043833340.pdf
    • http://jatyn.cn/upfiles/202107/file/1627020447.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ad1b40b76---86173428524.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e632872011---dekavuwugorobasi.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3af7ac08f2e4e513c056047097205c55/49197213087.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160704f396af25---kufonesadamagurupe.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/adcc818f9e40ba1c4148c16d716cf726/tokonuteza.pdf
    • http://arkystudio.eu/userfiles/files/dozuxoletafokufative.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0df467493---taluwi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb52f1f154---tamusutozokinemilipuzarib.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/tg25bvecvg9rvvtp4328h7lbee/nezajam.pdf
    • http://gialtour.it/themes/userfiles//files/29468104443.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed982426476---fuzuf.pdf
    • http://absolutelyneon.com/userfiles/file/15533351590.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9b8a6001006e5a6c3d65ffed14573051/seduninigijuvidamekuxow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=voiced+and+voiceless+sounds+list
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
font_01_sfnt_off0001079f.bin
8f66997ad30dd572127bb15dc3170777cf342e15d443e1327c41c7e968b3661d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 16984 bytes
font_02_sfnt_off000133df.bin
59c5ea8a9d6ff7451ad1decb1d8ad4b7c89747633fb6514cabfbbea778226cc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 10396 bytes