Malicious PDF — malware analysis report

Static analysis result for SHA-256 2227a7d805eb9384…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 13:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9ca0d3089f840fa63d00586677bf968 SHA-1: c2edc46757bcbd98361d20e2d5c5574006393b64 SHA-256: 2227a7d805eb9384f06767d4d350eae744e1173036862b5bb691703445a62af3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload storage locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/18e6c1f4720ffb9c72c18751b0175050/32652625375.pdf In PDF document text
    • http://lycee-elm.org/userfiles/file/kudakogug.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/5845503450.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8291edd8---40676834088.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a4cb06c68131beaae5f3259114c00a91/tajoja.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/59d3a28116c5b5e2241513b721f31501/pejavuroraguvotibupowuz.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5407117f27109cd426834ba04a65d0af/24860047699.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39dd8f336---46142366899.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xoladorutojopijutu.pdfIn PDF document text
    • http://alkanboya.com/files/file///97865093388.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d45233a92---62905129666.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/fekax.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/xuxisevabonagutemiwuxe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46dc8e46f---24006109054.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d05745d8ef3---48945714346.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/94941397067.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607894df3baee---faxopagosebugobikakajo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d341e57656---8949107774.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/13622047019.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/49609247986.pdfIn PDF document text
    • https://anup.bo/images/files/19137191402.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/jegesozisewapovimawinama.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ll0suru311p8karvtn888d71sd/wutegufarabivavepesud.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/dilafitifoxi.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0ed2ee2cf447ff05ac737e6a0b5c8821/pigiletomuvovameviwipuvop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=switzerland+currency+converter+pakistani+rupeesPDF 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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 17580 bytes
SHA-256: e77a66ee6bed12ab4a3a722fcdb2394a251598a84c2c12d1fa14853ab1da1cee
font_02_sfnt_off0001344c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344C 11100 bytes
SHA-256: 1d042fdd283cd62befdc86a7d1ca3997bc4b936d30ef6049c442d14482d805e8