Malicious PDF — malware analysis report

Static analysis result for SHA-256 229e7a72a2454e33…

MALICIOUS

PDF

144.7 KB Created: 2021-06-13 19:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4435d9a13c73bb71d4f5de737e66a5bf SHA-1: 35ab9c8eecfa8fad99f2b0e062584a754179304d SHA-256: 229e7a72a2454e33ce2008f9bc4e63da1854a700aa141eabb52939c6d54b9e78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=true+highschool+dxd+light+novel PDF link annotation
    • http://aep-tc.com/cache/fck_files/file/54907740532.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2eca2eb0---wazufexakufose.pdfIn PDF document text
    • http://championsview.net/userimages/1483598901.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/22h8125rkhi0k1179jkijapt66/likatuta.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bgjc9rr7he7dsfgg6kvgj4c5tl/taxofewogumaxevagurixo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0efa531371---pegefevosotexire.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f24bf470bf3ffd9da88b530904503631/77786646577.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4a97cdf58---32935735255.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/b8814876d29232f68b03503aa49ed3ec/kuvigomixuwo.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a4cd0ef82287a9ddb88ea6073802d6e1/dufudiworisilawewafedeg.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69659801596.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82f8436b3---dilodesatipovirogegazu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/35efaf4de8685c777201354476c72285/wagoxiluxilolokoweketobaj.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a548c67da89---foxesuritopifu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad505a442---rexozakegadikukumibedif.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xemesog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 55568 bytes
SHA-256: 831c65238b1c98898e3b1d32b9a46da75ec48018b9c3889b46c32769b5fefddb
font_01_sfnt_off0001e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E663 5068 bytes
SHA-256: bfed8d7ccb2abdfe782ace61ba41f67d580680a572ec8c7bd30fdf235fe729f3
font_02_sfnt_off0001f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7A6 12316 bytes
SHA-256: 0378552e5b670a84f156b7e625a533b2378fd176907a1ce9e2b157057870a491
font_03_sfnt_off00022012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22012 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

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