Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfe4981bd62e135…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a352c306053249b7a0d3a65fc3879a9c SHA-1: a91f1c7f57e47a36bb822540289fdf94a9040676 SHA-256: 1cfe4981bd62e135a67dd5e8cdec48e0db6be7b2eaf55bac065207c30b51be9f
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=michael+jackson+the+experience+ppsspp PDF link annotation
    • https://ekinyalitim.com/depo/sayfaresim/file/tufugironivonisuv.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/jezixobanufekufolisikiko.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/45845884234.pdfIn PDF document text
    • http://petrduchek.com/files/lanupekafoluganapawezafe.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xodonuzajis.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/92685025098.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/sibazidodo.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zazaxiwubovipenuda.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/58148060274.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/jopujemurunofobode.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/99364593321.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/diditaxase.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/tazokufadomiwazemi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/06c54bbfda22d98623cd8cd04eb63e41/ronux.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jofomez.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/22097273126.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7a77270a---53854521995.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/37039710312.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/c37a72adfda09230d69132b047146881/wenexa.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/01/file/20210901_210803_183.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/o0bousu7kijr2ii71d37eogsl6/64089529439.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/biwev.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/kepunafodobodopapet.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/58200866788.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_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 10788 bytes
SHA-256: dd860a8ffec0247ada7092875343b6d3142e348e65c6943d2326f1bfb27d9f6d
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 17176 bytes
SHA-256: bc55ec8c5e893b508c3555a6a084ceee1b9081dbef11788e67ce0305bcaebf51
font_02_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1