Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5c57598c59505f…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 09:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5b0fc3f3e53355ad5b738b1c2d26251 SHA-1: 95ef8cc4a6a2e6b2c262b6a2f904b29f85cce0e8 SHA-256: ba5c57598c59505f775091971bee1f9abe4853c54b2930cb2005c9842647ce70
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, likely intended to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a76d64595---radijixidarini.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5e34aebbichhr2muqb65ielvn/33417709262.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a279e7837b8efa2766aa6b88bb8823fa/68403633873.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/kanalob.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d52d99775e52f247cb1d59a4b1e7a3a3/8382213142.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/bewaxawu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7363027e07---gifuvixuvelekupok.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727e549ba93---7612802638.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/lerubemefeliv.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/24851814388.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e516071dd2edbd535c17f3344c955aac/85628857676.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/15593516761.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/derutezekegagapujovitis.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8a21b2c39---finajujujadefabutefe.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/71532963994.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/55806567822.pdfIn PDF document text
    • http://homeopathyhk.com/files/tibonadunevomupifesadu.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/98526419471.pdfIn PDF document text
    • http://minerva-collection.net/files/files/gejepasodabaligifex.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f236ca151da15164df8e3678eff46e1a/22257255415.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/virimupatimavalizoluru.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce932c56d.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbe31cab6---xemurefezuwiwoxafokiwa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8c1e52cf---79149572741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=weed+firm+2+hack+downloadPDF 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_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 16864 bytes
SHA-256: 89b583beb29d55ebf3999099593459684cd0435c7b38d50cee883b333fd9d9df
font_02_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 10768 bytes
SHA-256: e056d402dbe78efd211ef2ee45d00d8b4393c9aaa71d276744d140c05b75f7a4