Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c2d8d758652a0b…

MALICIOUS

PDF

107.7 KB Created: 2021-08-07 05:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29e55c6c406e26e43923510d63d45d26 SHA-1: 73c03c485addd5d43184026cd4cacd4591a0452a SHA-256: 92c2d8d758652a0bd764eaf108a50bcfd7e9d696344b6e7c342ee8918cc5e282
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098caec7c174---gijofateraxabarifuxi.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fc6f5529e12b94290c4f09924ac5e731/11062594893.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d7a0f1ade0b641ad9a93f09399c07793/tilew.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c49628953---83350487037.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210531194922_500549631.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/polusapafutunuwivan.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/11981404626.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/43522314333.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/27989cdf09e93651fd0a8ec2cd46c0af/18168142550.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/pazavegepipubogowik.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/67b2215d05f148155dd62d963e92bdb5/20704231640.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089f44ec0d0a---30172614603.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/bozaxejugipodomapobagadut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be1b911a6f---62492402385.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/loh9d0daumbf7ek6456mhva541/82797660514.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/fikoxuribopeduza.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/38567281602.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3ba0e35ad1984c54255b9fba26035d1b/98452672165.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dixabanapemuvixo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/152068456660a11c6c1407e.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5jhir24476aocl7iql77s7da24/jimepisulewapud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=arcsight+quick+flex+parser+toolPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/220fcaed24d1fa1355239cc6c83191f2/nomepu.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_off00013c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C50 18956 bytes
SHA-256: e7059c6d5b05837c1b256e32de74bba7b8aebe847412a2ab7e1b5357bf9ee42a
font_01_sfnt_off00016e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E55 11076 bytes
SHA-256: d0dd8388b4935192e649142bf9d1421d2d8938ed8f965bcc40eb4324560bd13d
font_02_sfnt_off00018809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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