Malicious PDF — malware analysis report

Static analysis result for SHA-256 738058f29610340b…

MALICIOUS

PDF

93.1 KB Created: 2021-06-12 06:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9ce29a2e88107363d5200cf0db32fff3 SHA-1: 7da021c6840d41b2ee92383cb65242468db678d8 SHA-256: 738058f29610340b766635cc9513216badb97002fc0116da252ab0d3e4e5e98e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=extinct+the+giant+deer+reading+answers+mini+ielts PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa36f184e---45559925691.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6dj86tl6eddmb9qucj4pekc5di/rurukexisurubarutiser.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/saxadulixezap.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b3fec17e5af27109ca733037d7b8e38a/83868070952.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/66c7c9f5e684fc2a0efc93eca1e6325b/82448137450.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/53822535370.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1e9d9155ee630446ca9b67bef3a1e451/83929158967.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/nabagokanevikoxotuviki.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcdce1e37c---mekimuxizugagimodigav.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/garanudekuwozat.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/33764521076.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16090f4bcd676c---titevunagupisi.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/budeligegokutagop.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8smi9jk04pv4n0r5s0kj2benas/17391612427.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b447de4adfc---vuxuluvugafawafexo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/53a8444b7ee12b54d81b2997f3b5b527/17757127439.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926dfba84fd---teluvujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F29 5468 bytes
SHA-256: e4415e2b7c40bbf4d9e767e42026f905029ec93cb186948ead75e4d76c8d01b9
font_01_sfnt_off000131af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AF 23736 bytes
SHA-256: c4681d8f4c10f445bce42b8642816eb5fde5b33f5175a72a9fb88a8a0b02082d