Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f3cb161574cc6a…

MALICIOUS

PDF

86.8 KB Created: 2021-07-21 04:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 436917267268fe50a1b22d7f67dbfcc2 SHA-1: 3fec219a580aa84a046f5f379b340d6b9e03ca28 SHA-256: e0f3cb161574cc6a4664b0f8594d5417d45c061f26eae4f572aedb288d504ca4
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to exploit search engine optimization or use disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b538fbe7a5---93820146269.pdf In PDF document text
    • https://sport-jicin.cz/dokumenty/vabujosadomumuzuja.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e332f7ee54---19990928592.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/3028708513.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/40991b31319c897d82e8925b0fd03b1c/jevegefisatisete.pdfIn PDF document text
    • https://naoshima-habitant.com/zigerivum.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607718ff8c26a---44444567358.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7709c8d475---dulug.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/fopenijunosiwuwarobaxakos.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/17101922811.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/tuzexagexat.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c40164e38f---59486946819.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210702125625.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/99d6568ae58a927dcf6a54e306e8852c/32386693636.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/wibipopogonisun.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7562707d76---pupaj.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/67982195338.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/nikakujobumuxawezogiziva.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/junutemadelam.pdfIn PDF document text
    • https://vestol.bg/files/file/sagaxinitesutaxofa.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/semijafivutenubupegot.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/30238466898.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/82322119568.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gezosat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+evangelinaPDF 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_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 19180 bytes
SHA-256: 15995613791caa0e8bb26d1d93c1aec1106b1ae9d5d2ef3c4c9c84185c35abf4
font_01_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10084 bytes
SHA-256: 21ab90eab07ae9537eef90a86425fb3f8642441148fb9d7daad876ca9fdbae1d
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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