Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd5113a225a12aa…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 11:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 661d68dfb65aad6d00cd72dfc8721e7d SHA-1: 982d78bc9270eea7fd15bb4e26948cb8de353922 SHA-256: edd5113a225a12aa20b8c51a2d44db49d840477efc0b2d4e3c9fa96fad15d2a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://chcial.ru/uplcv?utm_term=%C3%A9valuation+des+politiques+publiques+cours+pdf PDF link annotation
    • http://agcslohian.com/userfiles/file/penuvukamofomiweg.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/35468214736.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/judiz.pdfIn PDF document text
    • http://chemicalengineers.ie/images/gunurilegip.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b5176c4f---78935267772.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/36278927752.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/guzegarefopen.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/zedizusozonojumagujifalos.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/lazer.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4d220d412ae61134d3662646b0896503/merelagiroj.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/pituvanas.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///konuvetivipetoxo.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/49174626865.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/sotiraxujolokavetenenamob.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6cbmgltf86o570tbaudhmkm26p/42904010367.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/e52vjtkkfgbo8shrggkgimm181/90385477113.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b15a6dd85a---16379730110.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fed7babb---15292660583.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/tijavozavemejanajun.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/46251342283.pdfIn PDF document text
    • http://saptpadi.com/files/file/95896376126.pdfIn PDF document text
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/kinatizadexulunavado.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/uuga0p0rj95hg12mu2bo9uuhm9/20100961016.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/59869826560.pdfIn PDF document text
    • 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_off0000b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 14608 bytes
SHA-256: c3bba6eced1f827444e60380519364225f1298e8c47a4d006c98f51966bf35de
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 11064 bytes
SHA-256: ac3d7f6032a4d0eb02b9d356291eb5a009b5eb91ecb7aef42574a3df0473a00c