Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ea9a930ef42753…

MALICIOUS

PDF

111.1 KB Created: 2021-07-02 11:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ff575a2cf3ede9202ee21746a0eb2f37 SHA-1: 311d34ad343d2997c63aaa7212adefe78b9a1780 SHA-256: 18ea9a930ef42753befb08cb2d33627d123ef54d56afd37aa600a4ea60c9d5ce
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=red+riding+hood+french PDF link annotation
    • https://nestuby.com/userfiles/file/luvogajadifos.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/944bc3bfc714b3720cbfcf353e59ca58/5477134408.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/47219101248.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/36ehe8lgnp75qq9evs1thcdvld/vepesirevitovapok.pdfIn PDF document text
    • https://iltuosarto.com/file/nunugun.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a62c40cfaa98f4ba51577cd1dd53bf23/gosovir.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/poguladekev.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084960321a05---99574282982.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/woxekokelenomaz.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e7ac1294b3a3ba85911ed16f052ce530/5337825043.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/31668104250.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959f31c53a6---57372768609.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f36981967a---gebewesizatawugiloba.pdfIn PDF document text
    • https://cape-electronics.com/media/file/29283447323.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/bisovakenig.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d475522108---pirorotumivelam.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/52203370261.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/29335693748.pdfIn PDF document text
    • https://tl-systems.hu/files/files/89435714034.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/11ec05fb63b8e3c0785f54ce93ba67cd/71316248242.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38713270d---jubasitesukuxepobalovup.pdfIn PDF document text
    • https://new-baby.me/userfiles/file/23068744029.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/62cc469a929ff531d9ac75237659827f/90645022107.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_off00014fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167FE 19028 bytes
SHA-256: 6f56f1efb50db776f44851a5f54e477aef408ec44072b899375ce610403bca9b
font_02_sfnt_off00019896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19896 10324 bytes
SHA-256: fe7e3e2ecaaca7fef66205560bcc5d5c988a72638d439b493bf0abc95f8a5189

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