Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7aa206d354d740…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebe2e02b794486bd9e2eba0a5f141425 SHA-1: c8ce3d0472172955217d5b762e63a9edb3a9d043 SHA-256: ea7aa206d354d7409b415f4a31fc47408294686adc2357ce3116daced059fa82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple external URIs and link farms suggests an attempt to distribute malicious content or redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160984aaf0bf31---waduzazarupojepubetaje.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160875b96510e5---41968600848.pdfIn PDF document text
    • http://mlead.net/images/e/file/dofaxufomojuzopakanutex.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/90028359515.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/sutifolezolerase.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/59882358684.pdfIn PDF document text
    • https://davaocarrental.com/images/file/5500736289.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/6915516421.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/39355129421.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/migalolis.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/dozuluwakizamojasazo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dovupox.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609d780d38e3e---12104387992.pdfIn PDF document text
    • http://industrialdevices.in/uploads/gelojiluni.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/wumofotelifuz.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/vimuweri.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mameninaruvofo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/womepawujegovobi.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/digej.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kanisagedapamanidelu.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/24845851284.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085263f5728f---95027917995.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=programa+ciudadanos+pdf+2019PDF 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_off0000d5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C3 11252 bytes
SHA-256: a32a6358db005031a3f0f8b0c40b21e8a11198b638898f74bbe0c8d1f5d853b2
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 19040 bytes
SHA-256: 589a2d9a84b03c1d4e2aed6ee17ec5d36db7d86d0e58a6885a0fb3b3be863d80
font_02_sfnt_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1