Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e711ed15e38de6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 22:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2fd2faea5c6c44b14c5af2470926c311 SHA-1: 84dcb742e725a3e0d334d241fae28bb818533ac7 SHA-256: 86e711ed15e38de60def5c0fe37facd7c1e303f531e7bd2d656c2e17c8925d6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to external URLs. The PDF contains numerous links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates this redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://groupunsur1.com/contents/files/wisabijidova.pdf In PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satajobababavore.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/42520675016.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rebom.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9987b6aaef7d29eef8ec9e4f1ccb543f/33113984948.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/jepezeselusowu.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/livurefawenujuvom.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/33815131713.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/teligelijenidariwelimoz.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/69198609249.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/05a2b30a1591aa34f29d23262f08b57c/neravigulilel.pdfIn PDF document text
    • http://tiquital.com/documentos/file/notefilelakozug.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/86786578454.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/57429414492.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d47ad4b062---98358746774.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/puwezotumaworowi.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/78609433494.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/dopizufisavixuvesal.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904085616.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cd72c55bf---39033854117.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/83037751314.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/mometasamil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+3+android+apk+obbPDF 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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 10484 bytes
SHA-256: 9a98c01cb762d06beb76f2d365d3f242ecff7148b4321224791dbb43e304a29b
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 17596 bytes
SHA-256: 1085f78d7d602d0f99773ef115cbafac4ceb06fe3a43390c9a3fd2354a503460
font_02_sfnt_off000124f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1