Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3410409f841d2b…

MALICIOUS

PDF

99.7 KB Created: 2021-09-21 04:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e075534fc00dff99acab7a689ae21af5 SHA-1: b2ee643776ad6619a912bd76590af647cd3cc3e9 SHA-256: cd3410409f841d2b8e261058eb802f23a0b24183192993de7f2d997bbd502104
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://wastran.ru/uplcv?utm_term=layarkaca21+streaming+film+movies PDF link annotation
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f932068a---15853010742.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/4915778809.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/rokesuvumilazu.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/porusati.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/62485465786.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3ec8aa5a---48609586706.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/29bf994a6e313f989fcdd6547ed63d1d/47089162975.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/59503550901.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/55498955577.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/11206966004.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/reketavijetazu.pdfIn PDF document text
    • http://unseretochter.ch/images/file/3092685735.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/84277684795.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/27333551944.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/wipuvale.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/zenefabaxokitokowobi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/6egbjbmtd48c1c436n4kjjsa86/42440737636.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/88545013606.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/47840470715.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/nixativiwuxegopoz.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zonasafasaxejeruzivogunor.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///bodozubewin.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/vekitumeson.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/50092145305.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/kimiduniwegiviranukemo.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_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 17720 bytes
SHA-256: cfb0596c2c35f8bc3164e690faf68f053bbf7a6ff9b0488698c46ab55f5a43d3
font_01_sfnt_off00015070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16887 11080 bytes
SHA-256: c61e164460d1eaf22498d5fb84366c5ca0bb9ec94e9e1f776cf54122efbcca9c