Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba477998d69e60de…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 11:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: abaef05d50d3c4ae6b8bb6a5fa40a2cf SHA-1: 196af40bfe6168355a77c4140120e891d2c2b177 SHA-256: ba477998d69e60dea3bfdada9db1ea5d627969cfd8aa70813ce83285afc7bf50
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and a 'download button' heuristic indicates a likely workflow where the user is prompted to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=gta+san+andreas+psp+romsmania PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9feb5b312350a4303d2a61416b72fe7d/78321992902.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/jugiserunidedamat.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/47649965284.pdfIn PDF document text
    • http://cpviettin.com/upload/files/gukavuzukegonuzososevalas.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/jugigawitigu.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/weromilivagarilovapik.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405015ac41a---15386599489.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/9103860625.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/dilimewanefa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45818b8de---xufanesavivagifomunu.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/88575490864.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/tejawenosanerav.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/guworenikosilexopene.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vuxufebojogajotituw.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904231328.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/podinored.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/mifeli.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/redetudosukuzu.pdfIn macro / runtime command snippet
    • http://lpxs168.com/filespath/files/20210910151529.pdfIn macro / runtime command snippet
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53228190927.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/guxakagax.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/babiniwesivipilotekoj.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nufevalexajikorazi.pdfIn PDF document text
    • http://boothbayharborshipIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 18068 bytes
SHA-256: 64162754eee43db04980f3217bf44eee6804f87c1c2ba9b89e8ec31386489973
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 10548 bytes
SHA-256: 04b7f154d04f210eb4cdb01a1ddd40c93f2a5b2e9eef0728c33da18aa8ff6bf1

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