Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c56296d3aefd761…

MALICIOUS

PDF

87.4 KB Created: 2021-08-22 02:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 93640166de0e2931e85b0208f8ad503f SHA-1: 0305a37cfcde8ed216f4e69422ce7456eb9e6b3f SHA-256: 0c56296d3aefd7619e4ccf0335a83b4ec24a63e09cd590c2fa91bcf1916e755a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://alexandrapanayotou.com/web/images/static/file/768173620.pdf In PDF document text
    • http://danfilenemd.com/clients/67744/File/puvofigibivamopipu.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/tazoredugulakasarajutom.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/19370701645.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3174f69a24b14c403fd615cda556c83f/lufezolabuwibubupebeke.pdfIn PDF document text
    • http://derma-dts.de/files/file/dosavuvivigusaxeperodi.pdfIn PDF document text
    • http://gtshotel.it/images/file/4700339152.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/277439966.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b3rhv30rteal6r9r470ujhlp8t/99127915829.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tn89s3h175e9grhcqmag0mq2q1/duwizafozexix.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210607103504_0bn3v3.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef401c097ce0a31b7ad9efa51f56e95b/divodidosakifafesigef.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a1089830f0d---6360700369.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9150bf83---40544394685.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742547e43f8---77381821596.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c91190d1d7---lawipisefatoxupe.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/99953274954.pdfIn PDF document text
    • http://mamitobe.ru/files/file/xuwilegoka.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/bugekujufeve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fae4b8f411---52784338612.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/79f99a9570fcef24ea43880512487715/73148959815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+game+gunship+battle+mod+apk+rexdlPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 17220 bytes
SHA-256: 05951d15be0837aebc626ee16326137e7fe3ab46a683217c87d43812eaf92b8c
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 11360 bytes
SHA-256: b399241424709c6b168eeb0b80f6d67952204a2581abf6cf3d18f6dc006159ad
font_03_sfnt_off000144d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D6 1704 bytes
SHA-256: 4399651035424788af89a61815135da753d7a2ba72e38705d6f444edb27b28e2

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