Malicious PDF — malware analysis report

Static analysis result for SHA-256 87dfc49f52bf10be…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 18:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 51ae05361f020b75dc8953220612b0a7 SHA-1: c8947a3b3eb62f79efe60386f9829ec4c3017ca8 SHA-256: 87dfc49f52bf10beb4cae73092dda4a14db39f5aa54840e3f0c12c6e937f3ed7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bagliodeimille.it/userfiles/files/barumiguvupaguranina.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/37225296812.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bf0280017e2021b4a7aaa0511164e694/jopebunebevibanedovar.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa938149e15816803b315183ff30c675/teruwutu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/44526827062.pdfIn PDF document text
    • https://maria-galland.ru/files/file/veselawawiwi.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/79149156554.pdfIn PDF document text
    • https://claudiodituri.it/uploads/jisewijimak.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xezupalow.pdfIn PDF document text
    • http://www.agot.pl/upload/file/zaxegewalojaliwod.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vgn9qb6ltkkivihgqro8gd26qd/zuwalekuvewadaziwadal.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/39316138146.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/35ca93470e7607ca977b9079239188f6/20343124691.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ce7ede06de603ee183b2568d87094567/selelakili.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f49cf72215195c01410ad1739225b139/61153246078.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c04a490a---mumedo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080c5926bbba---gafelulaziputodu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/vowutan.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/xexuguxesapexovidon.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/94ukkkguoq31s8bg2o63p1ktnr/jifupogibudife.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/qb069bq2dhmgdc7in0s98cs9pv/33908185556.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfa53e0546---bepovofesaxug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+caldera+baxi+main+24+fiPDF 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_off0000d22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 10784 bytes
SHA-256: 59df719daed993832601249cf25e3015ef1349da8e10fa003b5b8a5299ad8f8d
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 19168 bytes
SHA-256: b8756d3c122c8bfedbeefde34d8ddb0f7a6c49115228fe0f50e42b3efc9547de

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