Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb8422ebe83a641…

MALICIOUS

PDF

89.1 KB Created: 2021-09-20 11:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14ff1717728c33d5cbe8d3153d35b1c1 SHA-1: 7da81e8d4c463f933ac7d4a39f71b8fcd7d1b007 SHA-256: 8cb8422ebe83a64158538cc5ca9a882ffc65e6381d7d31daf39175e811d3e52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://autoandtruckrepair.net/nbloom/fckuploads/file/51299114422.pdf In PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/vuxiliv.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/vuterenewigelowimud.pdfIn PDF document text
    • http://konberdbio.com/upload/files/nipikifomopitevadexuvilo.pdfIn PDF document text
    • http://awards.nl/img/cms/file/31988167540.pdfIn PDF document text
    • http://spakimthi.com/upload/files/84124364418.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210917_30FDD6B86FBD5D2E.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/ganatigageselowelabali.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/seninaxuzopesujere.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ceb2f3d19---81863094108.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/dumujiwejupobew.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/nlu0k3mie9cjfupcin0ecj0fni/80529079936.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388b52acdca---fovorizuturadi.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191101333322.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/gilixatigetusizokiketapa.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139719f8b2e3---fowofor.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d48c1778fd---gipix.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jigok.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/19601748223.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021916045325291.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dujigokinerib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=this+is+us+watch+online+season+1PDF 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_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10428 bytes
SHA-256: ebf259ca90e109554ffe96cbbab92ec4ff79377770908c42e122fe2969468a2e
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 17720 bytes
SHA-256: e6cbe8fe17036bdffbd2fbfd94c0249b8efc2700e5f54aee8dbd06ba40bd6e96

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