Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a5b737000b309c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 14:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcf3c05ffcb52605cfb8c0a7ce4015a5 SHA-1: 3a1aac18d4093ff211920730f5b1d624bb44001c SHA-256: f7a5b737000b309cf183cd715aba1a9ee3145c9fc92dad1c1a2ad2647ded7b39
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, which is a common technique for executing malicious code. The numerous embedded URLs, many pointing to compromised WordPress sites, suggest a link farm designed to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f519db5f31e635566714146bad3d2eb5/mafosisopilixifat.pdf In PDF document text
    • http://chataphan.com/file_media/file_image/file/rimuzilogovok.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/32253796136.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e46606cbc1---95249448661.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/gagegedorotukafa.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/burumekafuzifofezalubidi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fce0181431cb5497c61c0b1c2aca90ff/79138885827.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/151f22d18c91e99ecff8941d08f44684/79342989644.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/49166836785.pdfIn PDF document text
    • http://etre-belle.su/images/file/68408509696.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/wenatasubub.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/defomanaxilevu.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/4321872378.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565d2e12d---leropisogagabaduwuv.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/dcab630015bd4a55aefa52e51eb0ce48/66293124021.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b18f2d69f7b---94341843385.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8be7ce728f---dutunipavamijapusezeto.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jncvv0ngjua6hq0810amsj2i5u/zijogikaneloguraxase.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/88213992054.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/0o6tv9l2n3pki92dg2hduedquc/72302603569.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/rasopoti.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/60032744698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=react+native+background+gradientPDF 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_off0000bd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 18240 bytes
SHA-256: 54513a008e754224d6095f8890625b157967757d6fd3cb55457dd3a5cd80b4cb
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 10772 bytes
SHA-256: 8668fa97dbe8daeca20bb36e6db7e3d92a13df5fb3f9e5f7749fb59baad004ec

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