Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d7e8afad340e36…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 17:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 753bbf8da5b133b8c3a528347995835d SHA-1: d6a60b26d77647e2dd921fc7d264e2332f7907bd SHA-256: c4d7e8afad340e3634b86bbb0f3d6d9c9a8114379bb952acf031017d5e8120f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of 'cmd.com' in the document text suggests an attempt to execute commands, likely to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • 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://oshcongregation.com/userfiles/file/ratoxuwedo.pdf In PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/61425615610.pdfIn PDF document text
    • http://bushurov.ru/images/files/92822894704.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gulaxanofeku.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/39037160845.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/89930080808.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ad5f526---39510327727.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/duvipipitagugusikedazipew.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210909230228_4b92uj.pdfIn PDF document text
    • http://qdcmd.com/data/files/kosewirozenojesiregamofu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fowuw.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/71554176695.pdfIn macro / runtime command snippet
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/r6aur0en0a8sticosgr174t5kh/xojinuzomojilovowufa.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/wajakapokuniludigon.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613770a88ae67---71616220386.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/3a3eadp17n333t6out5dkr20g4/wuxubuxuj.pdfIn PDF document text
    • http://www.jnvhardoi.org/ckfinder/userfiles/files/xuvilara.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/12387359876.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161334782bb52c---masawatoxonup.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/72542309043.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/37980719645.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4264bed0---lopiti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=a+field+guide+to+demons+pdfPDF 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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 10660 bytes
SHA-256: 2512eaf9a527934e36a7fa2f6525b1c7ea6cdaa95926b990428a5646f8dde16c
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 18016 bytes
SHA-256: 078ca83b3ec9b6a8a3295398143b427bbf72d2ea2ce14e62124d3a40b58e7512
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1