Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f34b0f43512702…

MALICIOUS

PDF

92.2 KB Created: 2021-09-17 09:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f0bba1d7d0ef6f7b0dfc8be5ef2a1e4 SHA-1: 643963558424532ecb0720886138038caec6a60b SHA-256: 07f34b0f43512702c764fd05343f44e101e0f86c230c087cd7b7ecf0bd4ae864
164 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 compromised CMS uploads or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=index+of+black+lightning+season+4 PDF link annotation
    • http://moskvaznaet.ru/upload/files/malar.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/manosumimadeseroborufugap.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/wukikugitugetunamovopa.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/22522563934.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/javibajilelanovumutibebiv.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/58595840827.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132090fec9ac---45568358139.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/jovanokusibefefexalajezu.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/99174263208.pdfIn PDF document text
    • http://pronobile.de/catalog/file/vurivovanusepekafegolu.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/tuxigetupireriwoxegowafa.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/96811549535.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jufexared.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/dibagakefasizilebuxepa.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d2ab4423d0ec24269732b9619e3a1b26/20236906143.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/jujukiritasukew.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30063113750.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/muzimejabejuvikoxu.pdfIn PDF document text
    • https://kimcert.org/E/file/nupepulifolizawozusojom.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/15166641259.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/viwedonipomojodope.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa4e1a094---78360877937.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/junazejezi.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_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 11020 bytes
SHA-256: 4fc0ba131f116533f1c3286efb984503dd7331dd9e9d329f91c127625840aa4e
font_01_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 18196 bytes
SHA-256: 055a935253ea4f6134a265adecfe281b3035b4500dc77eab34d0bc13b0bfd4fd
font_02_sfnt_off00014b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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