Malicious PDF — malware analysis report

Static analysis result for SHA-256 400f188993c63ee9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 04:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1d4fdaa96149e4b33231d8d904a3d2da SHA-1: 2b9270e1dded6736dcbfac2c05b9b216cc34a868 SHA-256: 400f188993c63ee9d021fdbfff820d5f9c875c79c7156f4bb715aaf016d1fd1a
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hmanagement.net/userfiles/file/dijisadixodole.pdf In PDF document text
    • https://southafricapools.com/contents//files/19650308524.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613169568f82b---noguwawib.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fusobabiwezisof.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/daxelodikupafigozorux.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m5k6e85ld9ocagfjbef5dfhfbq/jusasunefupewedagibas.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/30bbd3ade48d8b00c9eba1e028fce428/3742929901.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/supidezewo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc26bb8c28a---2601890538.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac48285185cc25977ae1842cc6bb7d5/lafexamowa.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/puxigilunafomokuxipujeti.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/jilafemegugofami.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/nofupanesawixi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0692784a21---79487118085.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/26997377839.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/89379209013.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/kijuramejur.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/1625573133.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608211abd9ec6---29478000217.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/16737215821.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wijobezarawobij.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c641e02b646---60060315560.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/boduzagumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=malaria+pdf+adalahPDF 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_off0000dedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDB 17040 bytes
SHA-256: a8c805643bb1c060ed946e81855673eae25afe466aca2ba1cc7ef14049e9109b
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 9964 bytes
SHA-256: e0c0ab948c91671f60ed3f961c65a17c8c82325ebe9f27e727f834f17d469793
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1