Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76356edd1d3b311…

MALICIOUS

PDF

88.6 KB Created: 2021-08-20 10:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fc5cbfd0a7f6dc518a785da963ab1e31 SHA-1: 8e05a010f7f921a6808e6862739b5818481ce028 SHA-256: c76356edd1d3b311a7dcc490e062e5ade00c710d433e355eab45ca7c60cdbe94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://studiomanzella.com/userfiles/files/direwuwibezemese.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/tibilulekedodotiz.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/if0h7jkcge87peo1nh8dc58j4o/tojupuvizo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb7c6426a7---sasijubix.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/lozaxelegelade.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/n1ucmkqtakaq9e3kn1ac6tnnmd/rotamubinalufutub.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/90518583504.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161011a23bfc84---13333325989.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1ae27b8e8---nozexafifexigepasatifej.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/nifujodadoxoxugur.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/50815235152.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097866b46bae---renitufivazezunoduna.pdfIn PDF document text
    • http://grimastone.ru/files/zaxinisexizuxi.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db9d1a8d52---winuxugevafovawatulajode.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/zimuzonotevolenupasozob.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/eigahsg2j3pu1fa4u2jjl35530/vinizexipudaruxive.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3ec985b4f1b66362ec260b07a38dbd4c/koninizuba.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/46797121368.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/48665121792.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/evkit923u6c1rqsr4d3cli7tg0/49672077257.pdfIn PDF document text
    • http://rayanchem.com/d/files/93747881865.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/lolilifajepajorovibew.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/fogegegipozakuguzalosum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=masse+volumique+seconde+exercices+corrig%C3%A9s+pdfPDF 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_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 18940 bytes
SHA-256: a02501627e3eb8ce29d9c23fb63bcbed7ca4828facb300b93dba73f68dccd825
font_01_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 11428 bytes
SHA-256: 4fab2f5c2b10b5bb4e2f3cdef0df38e2998dba1d82b661b61ccfefef3a1a1b96