Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea218d4c7d0a0f55…

MALICIOUS

PDF

93.2 KB Created: 2021-09-03 02:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 96e33289f60cb0533cedd9ad07f5f34f SHA-1: 1b5bcdf9f4cb0a8bf433c6492d74ad0635bf4f2e SHA-256: ea218d4c7d0a0f55a2c7c2d950c68aa6c2b8bbad382d48be9b775eb48fcb2d90
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. A critical heuristic indicates a lure for clipboard command execution, suggesting the document instructs users to copy and paste commands into a shell. Numerous URLs hosted on compromised WordPress sites and disposable domains were extracted, indicating a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb3e52b34d---kikugoxituzil.pdf In PDF document text
    • https://nexapos.com/upload/files/fedogidejigopono.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/49019959131.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/28573368052.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/12095115872.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612d106e046ec---wuxokogukexifopubodubami.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/34181949660.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/27517497810.pdfIn PDF document text
    • http://effektfilm.de/files/file/jumorijerakopu.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/17802672593.pdfIn PDF document text
    • http://ramz-alqassim.com/Files/files/pefobabow.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca783f2c92---42776467186.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/remapagozox.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/motejamowedobuw.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/gituvitijerokoponomasivot.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jt138sru9opea1g952nap8f3j0/donujubaxewado.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fd5f1f97fe544d7e10b0b17906c02ca2/zagapikaxu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b75046cdcf---fumuzuxomosik.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/32e3fbf463ebcb215a2b1e9feddea968/zexeke.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/93738835835.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a5cb92157---kunidifumerapuj.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/50df09f591a9924b49a3198f922398cd/72801579537.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/kaganipufokizut.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l4j9e5flnfqjtm5oi1tiuvptkj/58269482836.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/kulalarerepawuwimamekuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ozito+25cc+chainsaw+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_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB2 10788 bytes
SHA-256: f47d29c242bac021e272305435cf0f3f8ebd4132d2667cda5f3e81969a40846f
font_02_sfnt_off00013695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13695 18788 bytes
SHA-256: 2dce41164c0ae90925e303ccd4f656660f1e479bcb2abc2b7b42b6ebd7fa5f33