Malicious PDF — malware analysis report

Static analysis result for SHA-256 8366230acd8c7b9d…

MALICIOUS

PDF

79.5 KB Created: 2021-08-21 10:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 120df601c29b5543df3aae31adf8b017 SHA-1: 83cf1c6589ae5a6f58ab1ed4855a6526fbaee45f SHA-256: 8366230acd8c7b9d23513f1e6d316edad742f6799715b8ed1c42a91436bf17a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://scheiden-maassluis.nl/uploads//file/71571164035.pdf In PDF document text
    • http://retco.ge/ckfinder/userfiles/files/tebosetovokevexoxevu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3e616ad4---korixonoxukinefaxeg.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/gisuzub.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/busixokubipimejebepenoteg.pdfIn PDF document text
    • http://shshalloffame.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/xamemovumub.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160791f3b76ed9---puwazumegejimuxe.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0dc1fbf2---gananasotiwomikelipuj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee33aca2ca9---36600816831.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bcea64b8428---murovutarasaruki.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/i420p7o4ghqot8ab90r94aebrq/31585788219.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/limopanalororabab.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/75376165311.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/79280828159.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/97703ea686fad3b1cf9363995a571885/30460024628.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/gobodubo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429043017797664.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/muvogewifoxugukij.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/oom0b3fabc36m0b8d9d3b3e9r3/14782972217.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb25766589---mavup.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/1495461205.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/f78b043bgmb7k2tonb3fvpkn3b/66483555432.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/tarapomadi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kordrf2qicj9ls7pkh4moop3d7/jujokutepero.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fidimifipela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mukunda+murari+mp3+song+download+kannadaPDF 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_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 17388 bytes
SHA-256: 8825d248ad4af68615671625ccc7868a8fc5d2f9d71f572e5a882721be061549
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 10948 bytes
SHA-256: eff1fc1728339e43ec5f29b9ece6f3bb08e3a362ed64013f4c7a117c6857fd09