Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89145acabdf439a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 19:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ad0e8e382a6f8613e769f8ece8a50095 SHA-1: 11b9ceef7311f8d40a4ed1047c69f35f9c038eab SHA-256: f89145acabdf439a9b220a06aca6fb0787ed9251fb6bf9fa858ed96d6c494bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://coretry.ru/uplcv?utm_term=convert+ms+word+to+pdf+java PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/hr4293ips4adnp7jq40g8t1h55/benojisorijafawasevoge.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///woxofomotizanumimufowurek.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5aaf767a7c43f3cd6c0a1244803cecc8/76663301904.pdfIn PDF document text
    • https://pcetravel.com/files/file/zofinuzuxozivif.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/movewibe.pdfIn PDF document text
    • http://maihome.hu/admin1/file/89269017707.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086124c8ebc0---80739885920.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d93050c9703---51334325472.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/makijujigurufarix.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160870eaf6af3b---85048073200.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/kelivifani.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a7888e0a---55347596351.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/ab1d4de6cc20392c98702973950ce9e6/vosinepenolowinap.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rutujov.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kc5dmk21518brh2vb4q3i4hsfa/sepopemofefoveguzuxonudiw.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/rovevegufovakimemale.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ce918aadf6e---70525472220.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16070b28487638---91258496835.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210803_818C237C7C4C82AD.pdfIn PDF document text
    • http://soupworld.de/upload/file/30206206564.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92643751946.pdfIn PDF document text
    • http://hrudolf.com/userfiles/74681201479.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/bikarujolidilowudopoju.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jogigadezebup.pdfIn PDF document text
    • http://proxima-design.cz/files/file/11156703170.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_off0000baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF8 16376 bytes
SHA-256: c1dc1ef3087761708aa806d3318123b806d5cf51d4c53dda540e197b55d12e43
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 10832 bytes
SHA-256: 2945eb8a3afb49a501b70e9981fa0f189a9d0e3f03d6fe598b9cc6338da54d64
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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