Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14dc1eb12e2e583…

MALICIOUS

PDF

96.1 KB Created: 2021-09-11 19:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6e6f8309728c79cedcd8fc50b6384c61 SHA-1: 249427ca7f2f25676a79114d33a8309b40490133 SHA-256: c14dc1eb12e2e583682a7804ce648f31c3bfcd4ae0917e1c71f65906b9a81bc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=a+quiet+place+full+movie+watch+free PDF link annotation
    • http://speckletrack.com/update/editor/file/87892562123.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/60103162917.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/86089809223.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/gijuribufodudi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/jatijekoxemiwunonogitano.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/wowigopenixomuxufofix.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/22186353830.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391adcdc662---rimun.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/mixigodo.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/fodejowutegojosof.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/fajakusixazav.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3b647207---xakoxi.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25510182973.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/21941746444.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/48443616060.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/22259776229.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/fekozexibuvaf.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090412205972.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/wudeladurixoz.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/ridalarorokazarenon.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/16810176634.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/kekeruvulazobemalin.pdfIn PDF document text
    • https://proxus.nl/file/56537914883.pdfIn PDF document text
    • http://slsnn.ru/content/file/55040089230.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc10513aa---sagok.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_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 18284 bytes
SHA-256: c4877f4583b1c125a1b19a533d647de98616ae8e277874a854f436e850e3eec1
font_01_sfnt_off00014133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001594a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594A 10852 bytes
SHA-256: d4ec699c70c84534912cd271bdbae967b49d1cb365b4c790d6c97aef6d49d0ef