Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe255d8692716eaf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 166fa4def720edb785f5e159e009b16b SHA-1: 428ee1c0d900531b1a2e0d30acd65184db74dc7a SHA-256: fe255d8692716eaf3bf116e41411c0f672ee2c54a1125d81c65a189d80b554bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gizaviation.com/uploads/files/guzimovawedirogimusirotev.pdf In PDF document text
    • https://corpusbg.com/files/fck/file/rekuzoputetugodusem.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/adrslrc37u7vd73e1lfac2uqls/ribejinivuwiwajuse.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vufogarazowifugabotorep.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tugab.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/78177026969.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919113146.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesimujewixarovaledodezer.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/xokibadapodusub.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/rukatazazis.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/voxugegegetalof.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/68942567475.pdfIn PDF document text
    • http://axwelindia.com/uploads/68836119099.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/golobu.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/wuvemofokakuvosisolagap.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zevigori.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/jolodovapadanab.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a806081a0d3489bb72220d3d748a6344/37122306856.pdfIn PDF document text
    • http://bushurov.ru/images/files/bulom.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/76b4368d1211f018a83b755d5f8d8be4/29541157229.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/14411634495.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rab41k7u9o8htqsjgg9jkcqp46/44413823913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+3+android+patchPDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 17300 bytes
SHA-256: 631b8d621d0b3504843fd46fd93272cf75bdb0a02a39e6a1a19cee71d768668c
font_01_sfnt_off000106cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CF 10476 bytes
SHA-256: 9b1109e5b75852a43f547aa9a5e5e2c8c6d5bb8b2f03e31594230d44f1dd11d2
font_02_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1