Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8ab8d3d72a4707…

MALICIOUS

PDF

72.0 KB Created: 2021-09-21 13:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2bf53338b7811a76d493134ebbbdf88c SHA-1: b5ffc154a2a85b81897069968e0e25e977bc42e3 SHA-256: 2c8ab8d3d72a47070113f51093ec49aae8bab4b0f12aeae7499b42edfe263b3a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites, designed to appear as download locations. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6688

Heuristics 5

  • 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
  • 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://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148766de804f---baguli.pdf In PDF document text
    • http://rydelko.eu/userfiles/file/romomuvexoxozemeserixuf.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/kewaterewik.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pokakaliwavuladipetavef.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/zilikasemefetajitiwirak.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/pinelekasoparo.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202199433291559.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f14fbb77e13eec4d954c7c5b165defc6/magesixetajok.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/ninenetopu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/16352051641.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62657439681.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/zekufomemasu.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/49454168709.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/84968141547.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/24817615503.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443c4d9d68b---xatawuwurobepefulajotebu.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/21062098810.pdfIn PDF document text
    • http://ping-property.com/user_img/files/22243676092.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/14954366589.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/beguxevokoza.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/safodobamevixofok.pdfIn PDF document text
    • http://kezmosas.hu/files/file/31717140802.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/83562756073.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/tiziziseluzorasu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6a5e27c0---66090334073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+apk+from+play+store+without+accountPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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