Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ebfab1e6f0d283…

MALICIOUS

PDF

88.1 KB Created: 2021-07-20 19:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ae84e8552ba322a83c307a62fc883a47 SHA-1: bdb43f950d0c13c63617ad261392af31816df759 SHA-256: 23ebfab1e6f0d283ceb5f6b8416a1587b6bc4cf75ca793443ab3b27f09d6c876
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or conduct phishing. The presence of multiple links on disposable hosting and the use of UTM parameters further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a153f8d0b84---86860246996.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ab2784d1---mapemewokozutes.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/103748280860a61e596660c.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c997f3602f2b686173478b7bb2a88809/woxupuvanotikof.pdfIn PDF document text
    • https://angkagenap.com/contents//files/76216809965.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a206bf24e24---dakigovewaxeluxadun.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8321418b1730265d656bd39815e4fd2d/xiratu.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sofevopasunajoxuroj.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/908deb19c95fd3ac2ff89f876c0b116a/zasisekewusa.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/bawarenisezesobex.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bca90a2b0df---62879280627.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/kisididubi.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wuwaratisewoxakumopus.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/69845891551.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/mivojubijo.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/vowajuzeku.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/viloze.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/74958144525.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a7d2ba88615e09e5892a793f038ed3ca/fapolezadimipoluvokal.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/37803710103.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/jevumilisujibemujan.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bdlh9balej3rk56sepqvtsvbp5/nikorifuzatetivibupim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=educating+our+future+1996PDF 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_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 17800 bytes
SHA-256: acdf0d62e7adf8da10dd0fd8379e5718995f6f41747610863a84d400a538f2c3
font_01_sfnt_off00012210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 10908 bytes
SHA-256: 4956fdee6cd64eec4957c998d327faf9eb3877c40b7795043a26aa7c6fa1aa02

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