Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cd6d5aeb146911…

MALICIOUS

PDF

87.7 KB Created: 2021-09-11 01:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa6870ad3745305f0306d869e7be4059 SHA-1: 2da6d46b48b931e5b262ea0c9c529c51cc64dd3b SHA-256: 51cd6d5aeb1469115752a9cf09ea8ed9ac1440934d4eb83c9d102af3faf9d069
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. Heuristics indicate it's a link farm on disposable hosting and points to compromised WordPress uploads. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ylpcl.com/ckfinder/userfiles/files/jalogariketatitekuze.pdf In PDF document text
    • http://ustunongel.com/image/files/66650519734.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/pejelow.pdfIn PDF document text
    • https://everestart.com/images/stories/file/41721308114.pdfIn PDF document text
    • http://fedime.org/imagenes/zirifoba.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/18840908599.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/27566597886.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/wegazofujukuwizan.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/192630739.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/50456463857.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2648b7bb---pizutibagireneputeb.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae017420d---99278148070.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/girejabigefu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371902a2796---litunodetafovukosatalijik.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///89165646144.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/kugasebavesufuduva.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jazoma.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/gujobigosawavifesupof.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/93809285466.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191101124656.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/pokebasedon.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/kukolojumase.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/tavamiwovabaz.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b791e768bf---92800683900.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/mivekon.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91591110844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=crash+bandicoot+app+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 10604 bytes
SHA-256: 9bebdefcaeeb82df73463ba02040366d6555787c4c850fe51247e1ca2c34f46e
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10351 21416 bytes
SHA-256: b9e2ca6fcf38a10d8aee76c5dd5891048b0f49397ce257705cb5b002ee484762
font_03_sfnt_off000139e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E3 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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