Malicious PDF — malware analysis report

Static analysis result for SHA-256 597889b7be2e2351…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fdd02d73a2dbbba7b9073f0ebbd1cee SHA-1: 4cc24df3e13c6ce1bf7c7d3805917ed436a40c29 SHA-256: 597889b7be2e2351e89879dbba0409484084991b55080f8d780b3fce3014f91b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5ce7907598ceb2171f60aed4682a7aa/xeduwijufuf.pdf In PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44dd7897a---koxugose.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/b889cd244d43360a1f258b3554b48d4a/situlep.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41135a9c33---26678569183.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/xuvekizezenokiweg.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f6ab835d1---ruzuralezopabukozikugiso.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/jegalofalonisuliwumolo.pdfIn PDF document text
    • http://panteres.com/files/files/sodenefofefus.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4950acab9ca815419d53980ee8186722/73175051942.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/lavagurelefa.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/gulepixejubegudaji.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/30727116933.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd754d682---90491191902.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/86508623789.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb441d705---25790457535.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cb3ac8ec92c11fca66357404539afd3a/43482307633.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210808/files/20210808065833.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/608a4d6321773bed4dc67a71245c6b58/49507048350.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/79648584567.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e40c8e80---20117779425.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/74017791225.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/18432126327.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2373f5b4ac719fa1b256d796b2cd8241/80053279922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fulltone+ocd+v4+manualPDF 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_off0000c892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 10392 bytes
SHA-256: fca8c0350ce768238e0bfbcdad859bc21ddba7164466cf367e2f2891c547998d
font_02_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 17560 bytes
SHA-256: c65aa0f7f7dfd3e335bf3a2db03a8fa3cb90b3c0e7c80af9c076ebafd2f567e6

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