Malicious PDF — malware analysis report

Static analysis result for SHA-256 94280f0b9fc98898…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15260007ebbe525075e148909fd9a257 SHA-1: 13a83c1e660f8d494c49cdc5d75cfc8acdce9d02 SHA-256: 94280f0b9fc98898c556df9e2670de89d156eb0bbcc744e297d0d23c5467f960
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/xitipawiferesuxemi.pdf In PDF document text
    • https://digireg.cn/upload/futedapusufuropozani.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/9991409566.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c483ab76392---6784622961.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/jadumoluvaduwawe.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/72463026487.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf00ba74edb---135420951.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/garoxej.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e2891b9---86861922170.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4b6d92dea201fb4a295ae627e088f7f1/90481933309.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/pifada.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726f2a9c29---3051238013.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/65016177979.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7fa8bd57776ee7e4fd02f3a617da36ae/51545293849.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/murekatemedutumume.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/77792478736.pdfIn PDF document text
    • https://allianztc.ro/files/file/50002808166.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/42552169941.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92686b983c---25987084770.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/89426203084.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608204f5a3442---12993786792.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tolazetagiwajafugodexi.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/lewotusenatikejogulod.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0bd63c016---63796321463.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a36d03b919---8175664726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+retirement+photo+booth+props+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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 10672 bytes
SHA-256: 7538f3162497093f8174c18f0f99b4ebc97834057899d4ed32709f34c16ee823
font_01_sfnt_off0000edb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB3 17092 bytes
SHA-256: 16e46cf040cb3f4debd5d000ee2e28550c967f51553a507334b0d09fba41cf82
font_02_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1