Malicious PDF — malware analysis report

Static analysis result for SHA-256 137bfdc910d544c8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-26 03:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 35aa640ef15f7384f30e0daa66116212 SHA-1: 66995363fc6508a50d82f0f49175d8da57a46c09 SHA-256: 137bfdc910d544c8a1ce390dd1e266803f21f15e4d6e847a779b76b9745ca052
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and ML classifiers. It contains numerous embedded URLs pointing to compromised websites, many of which are hosted on WordPress upload directories. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or references to executable content, further indicating malicious intent. The presence of external URIs and link farms on disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://oniceh.ru/uplcv?utm_term=gta+5+carl+johnson+mod PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0b177a89---belazemotom.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/86856498404.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zifinipapaze.pdfIn PDF document text
    • http://hanleyresources.com/images/83400219317.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/45157521575.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/takojemivirodak.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/lures.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f98a26f459---valemekagofurowekas.pdfIn PDF document text
    • https://onecre.com/images/content/files/70951729000.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/4979393139.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/51487983325.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q88jku0op40ta5uih2igls7dao/filebeb.pdfIn macro / runtime command snippet
    • https://kimcert.org/E/file/kezalepopozulubut.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/ritapifatefozizuv.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/8803807906.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/38606215699.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/61520125861.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/vedagunaruluw.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/39718682152.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/32459450190.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/sevixixer.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/87b89ba9d1bead41aa66bf58888411fa/dotun.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/51127299542.pdfIn PDF document text
    • https://educhina.mn/editor/files/bevapedafar.pdfIn PDF document text
    • http://les-dvorik.ru/useIn macro / runtime command snippet
    • 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_off0000b148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB148 19280 bytes
SHA-256: 37d9e04c67fa2f42e39dd0ce0395be6bddc68dc36f45cae79c417be5d8bb013e
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10716 bytes
SHA-256: 65c9b230567c4411a4205fc714e516e905d98c9e79fb2877e05df71c4600f97d
font_02_sfnt_off0000fb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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