Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b32b50fe6407ed…

MALICIOUS

PDF

113.1 KB Created: 2021-07-23 17:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5afe70555ac7f8adf22e81f76f3f89d9 SHA-1: ab8c35262d37f8f63ac243ecd532e60074fc14e9 SHA-256: d2b32b50fe6407ed3c4a7530a3ad865a0da5acfa78a7c87b97f5ae5019218604
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to exploit users via compromised websites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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
  • 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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827c93e9d32---xarekozukemozif.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bs8952qgvc77tuem153uvqsi5p/dezibipezokowo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210620063503.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/d3e64a8f403cb2b2d0837da2af9b5e0a/zamelotexinoweterevopusa.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073832f59864---8278278656.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5a9070d8e706da026809a500cabaf107/nexatag.pdfIn PDF document text
    • http://vinamex.info/uploads/news_file/duxodimeweguzesulagut.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/99928702911.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afb43e6333d---vokuxixoxu.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c42e63c3d---japonawi.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/30152276487.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072427be0c22---vanezibepasawixevizejomu.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/suniniwe.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/jenuvomovosixorupixo.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/puveparidegavuleperivugu.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/gekukojemesatekeza.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sanodinodogokibuwadizi.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/46960665680.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/23750147239.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607debf28363f---20263187081.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/79431784652.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/ipkn27phuhu9uus2k653i7ge27/sotijexoganukipajepuf.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/jikarofafu.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/83851405855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+order+do+you+read+the+ranger%27s+apprentice+seriesPDF 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_off000155dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DD 17520 bytes
SHA-256: 509a9110adce141ef98accd8ea921b4da05801c9dfc0573af636fe689d9e1d66
font_01_sfnt_off000183a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183A4 10988 bytes
SHA-256: b51e3f03817c04d4c3247d495f2bfe35a40f0ec3fae0176b20ba6376811f43f6
font_02_sfnt_off00019d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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