Malicious PDF — malware analysis report

Static analysis result for SHA-256 223d9cd2620fe415…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 14:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 77b543d6c7d1ca5cef36502f6a79bc84 SHA-1: 0671b780976cae86780f0bba2e668e99e8726d51 SHA-256: 223d9cd2620fe415e1717fdf4ef915e0c4b138fde9559272ba1a857035a1d94c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure implies a potential for exploiting PDF vulnerabilities or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f92d4280---buxejutodaminuzu.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/94a8bmuif7q4qbugi3g01n8ao6/7826198606.pdfIn PDF document text
    • http://healthywithhart.com/res/file/bakubawasegidezamafone.pdfIn PDF document text
    • https://afayl.com/userfiles/file/12194572151.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/lizenugozufeposolul.pdfIn PDF document text
    • http://princeverma.in/uploads/files/85740140531.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/135140c6c1d8a91feea0fdaec430ccbe/pukosuwadikuf.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/12449381247.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/7bb88db0a47cea6ee27c789f5e171a15/tasikaridosidetenirege.pdfIn PDF document text
    • http://rurisnet.org/images/file/kisoziwawasek.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a321ac36bac---veruxilinekegelofav.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/volomuxidelokatanevi.pdfIn PDF document text
    • https://777mto.org/contents//files/17418305533.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/73a8ec74781624781859703f66b7d3ed/wozuxokaxuwatepemijoza.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/tododamasesezatatabu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210804033404193.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/94992021237.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b67312610---13958047049.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/junarekimati.pdfIn PDF document text
    • http://snsi.jp/image/news_file/74559768050.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b18673e19---31049293571.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///dewuwegofuvekato.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7bd9cddd9---14815076259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=scag+freedom+z+pro+manualPDF 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_off0000bc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9E 10840 bytes
SHA-256: 25e7b79084f39851ec265bf92114c90f45bacb856bc251521a7a266c6bfccbdc
font_01_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 15820 bytes
SHA-256: 1f970562b8b5d4d93378885fb103493cf1e1829b0efc71c279f5382381fa154d
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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