Malicious PDF — malware analysis report

Static analysis result for SHA-256 58012f794827f282…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 13:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23664a599b8c4297e7f6d1b238e6fb5e SHA-1: 4627099bf8d9d1016eeaec3e743f2bd8d093533f SHA-256: 58012f794827f28214071c3cb8cdea83b80c67c664fe670934cd3b22bc52d1dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, including one identified as a compromised WordPress upload, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://jar-ted.pl/file/76727723780.pdf In PDF document text
    • http://amghanoi.com/images/ckeditor/files/92469238550.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a93caa39e---dalajoxegizudokasefevov.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/93014598948.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/fawovufazikoxabedogikugav.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/vorazikifiputi.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/37750385065.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/56264509009.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/51290827363.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/68764540428.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/39296017125.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161453fa585967---namofaxufilif.pdfIn PDF document text
    • http://mq-water.net/upload/98531384884.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/84061836600.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613926201f3ab---kikuped.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/potogokikulazo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bakukimozote.pdfIn PDF document text
    • http://netart.hu/userfiles/file/30463116996.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/15630841912.pdfIn PDF document text
    • http://gibisch.org/files/files/bufadixiwajaxop.pdfIn PDF document text
    • https://suruburi.net/mm/file/minopokutetowamumerosod.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/78680904274.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/8523383442.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/29266502380.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/33298022376.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/32406236481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=install+windows+10+in+chromebookPDF 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_off0000b994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 11076 bytes
SHA-256: 3e949a8b942800d4e9cc942087bd571c8379c89089504320c55db05206a45b3b
font_02_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 15632 bytes
SHA-256: b2344e85290017844de3c290122d0be1a7b808a47174f45a07897aeffebb6297

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