Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b18f0ee83088a5…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 08:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b3569425a09ced40a24be218c50aa56 SHA-1: 9cef1d00ac2e1d120feab93c433d425034ee2553 SHA-256: e2b18f0ee83088a50d5c3cf56638db072ea068b6c1c250357a548ff9d8ebf7c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://satunatc.ac.th/ckfinder/userfiles/files/94536023786.pdf In PDF document text
    • https://syntellect.ru/Repository/file/bavadetasafet.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ttqs09l046b0un6fmuh87pgc35/597523538.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2280607287.pdfIn PDF document text
    • https://henklinders.nl/henklinders/upload/files/fomelilaki.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081559d65e3f---28966365209.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/xeres.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/36235600779.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/bikikegegiguwiginupese.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110c605483bb---53054830149.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/49445626563.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a82483a8836---gawesijowalazumukipumij.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/32872951491.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9b9o0fo5bu4ldlmhrccckrt03v/liwagovagisoto.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/gemux.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/sowoxipirigudiwogoz.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/pakewuj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64018929261.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/34522172123.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/46448826444.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db0b60f77---zaxomevotubolegibu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c767564f2b---guniwuzema.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/dewunazazibajopivoju.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b1e17156306fce9da290e8a0fc62282c/49741625356.pdfIn PDF document text
    • https://mahae.hu/files/files/70176015615.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/wemalarakomozusilanes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=clash+of+kings+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_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 19416 bytes
SHA-256: 1e08f5a0d5d132c6fe8ed3fac23b7a5409ff237a7d09f47d0de97806153043bb
font_01_sfnt_off0000feca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 10568 bytes
SHA-256: 4addfc58ec07cc50263accd8f9d10ef7ceee5113b57d837518e25b02d80cb930

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