Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd228de7e552085f…

MALICIOUS

PDF

91.3 KB Created: 2021-09-12 20:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c835db115c18d123c57c423395b64c21 SHA-1: 574a6011bee1b1b8654ebd18be552eb002049a1f SHA-256: bd228de7e552085fa8456f2a6faa42a43cfaf457d5adf55ed891c08e76a7f2bb
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://allytemp.ru/uplcv?utm_term=off+the+road+mod+apk+unlocked+all+cars PDF link annotation
    • http://scouttautomotive.com/editor_uploads/system/files/nives.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/76141641283.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gipamaliwatanojawezap.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/95185263565.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/xovibosoxogevunegiro.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/rotigatezew.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/72502399041.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/64539953121.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161370de201cf3---31864563464.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a26dadb39d7a7faccd45b9f6a0ccbf63/wezidumizowisutosojojowin.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/89695815577.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/86381971721.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/14629632944.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/39382493894.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267451613f---rumixikesetewijusej.pdfIn PDF document text
    • http://posuni.com/userfiles/file/lewadolu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7d9a0430f917cfabb924cff17d25572b/jogosifafo.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/66421396916.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea05d53e2---wibilade.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/zupobapipofixosudelo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bhf4647lrmimlla9jpuo9i61m3/49536120119.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/38396440867.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/48509583041.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 11008 bytes
SHA-256: 3d10fba0bd6e71963fb9b95e0e1a4cb2e43c3fc0cddab4aeb79d8e06fc6543ce
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 16380 bytes
SHA-256: 848385bda8fbfa417f457648f4719723a22ea52fa0c35cd83fe75662d5f2fdb2
font_02_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 23216 bytes
SHA-256: 9fde9b00714b859da35e6899540af6194539e0aa00ea1235369c15e0a66e9e8c
font_03_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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