Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6befae2c2345c50…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 05:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 175c50427716b3b7be4b046cb21ebf89 SHA-1: 458e7a390bf1c905a650163071dc955593c1e88c SHA-256: e6befae2c2345c50868a2cba36e93358217230f59e929b7505298ecec31e31a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pistant.ru/uplcv?utm_term=radiant+defense+full+apk PDF link annotation
    • http://familiehollander.nl/images/uploadedimages/file/bibosijasejuvupivaxosida.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/javilekelazo.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/saxegevozagipavamipipor.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/84845083584.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dogenijigipulodi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/q01bdi674qo75c9p8emmkqh1iq/41905337759.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219242046428031.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/romisiwifazusozo.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/17918632735.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/67325363370.pdfIn PDF document text
    • http://zzlhlt.com/userfiles/file/LianMeng202109290225467946.pdfIn PDF document text
    • http://opsir.eu/files/file/22201602210.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/dolukirilufelolo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135958e033d0---30483023313.pdfIn PDF document text
    • http://icareonline.net.au/ckfinder/icare/files/85853380007.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/67148340173.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/widaluwoxijowozasivota.pdfIn PDF document text
    • http://kammed.com/userfiles/file/getelorud.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/25506180730.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/tibesizibixuxetiw.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/pozenanudedetixu.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/58180685355.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/12639752263.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_off0000afd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD3 10508 bytes
SHA-256: 42e9aacce0eacfe789835d041483e63fb2982676fffc533c50994218a4a96ddd
font_01_sfnt_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 17476 bytes
SHA-256: e213f7ca0815d95951499c0a49b97d7a0976073a5efa769e015ab2335d824edb