Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8141b50a56f554…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 21:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 196d1bc4d66facb3dc35b62c6747b865 SHA-1: ecae56cac1db7148a76cf7dcb4f2921f1f0dc308 SHA-256: 2f8141b50a56f55433e5caae3a6805487bf27013fbcce206c46ff037bf75b3c9
124 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicative of a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The PDF structure and URL patterns align with common tactics for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.2081

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crewmak.ru/uplcv?utm_term=write+procedure+to+convert+existing+excel+worksheet+data+and+charts+to+an+html+document PDF link annotation
    • http://huabulaw.com/uploadpic/2021-9/file/2021091902522173499.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/52941412406.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/nipiniga.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/juzusikevekodemili.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/59993825634.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109080235477447.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe55bc95a4---razopixawuwizanudixibo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/ritojegofaxazezidori.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f432385023---dadidap.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/72420625760.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/nujuj.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911153516.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/4241863047.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/39032833272.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/zifupejikabivonavewijob.pdfIn PDF document text
    • http://wohingltd.com/userfiles/41318750366.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210917132101901.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q8liulcravd44v0v7k5dgu63b9/tinozizajivipoxuwawu.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/42762605023.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/98144267930.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/liboraponovob.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/xutesabaf.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/xazim.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sekudidaxevebofowinigok.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/70304930186.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwiguxowetoxuboxabu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/64cfe2e4e0f798778cb5cab6f8ffaf90/tufigewepib.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16620 bytes
SHA-256: 9df0cb619694f1f0a75684ffc30e722a0410dc0d61bf1946d88cfb083030c204