Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aba227f510ab6a…

MALICIOUS

PDF

104.2 KB Created: 2021-09-06 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92c825138e360cc7ba73431a2dcef4a4 SHA-1: d423d61afe89ec65d49c21f01b54e5d6ab7e9f7b SHA-256: 45aba227f510ab6a7cbec1fe5fe2afb13af16a647955031192be3fed2acd0f75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://avistravel.ro/userfiles/file/nibaxaxufexavigametelem.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/413e5e06e93d64724011c78b9a314387/48353450097.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/54267781143.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c1c24d29d8c---28864041462.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f9e9a35f---71287403424.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/mikusu.pdfIn PDF document text
    • http://net-work.cz/data/file/xopadisidakijig.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/22266400495.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/voruxapusatosilipuj.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/1129102d98956bd3f32988e5b03d4586/nomebuf.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/61856184198.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9a193c9a3ae7e0a155c745e5aac68daa/13272816803.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07906a11c4---31868554626.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/54b4f8d697fd7057a315fc3a2a2403fb/32815730937.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/5353275776.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/70724203663.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16118ddd6ba2f5---puwovomalizoruxitaxarix.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/tiworajutalawewugorap.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/24375146056.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/66206410601.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10ebada26---pulalaguduwekad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=curso+de+viol%C3%A3o+intermediario+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_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D48 22864 bytes
SHA-256: 0b17513cb280d2b8ed83f00177fa84c64b050ea9a3bf659c81bf0b84887318ea
font_02_sfnt_off0001777d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777D 11120 bytes
SHA-256: 9b8dccd123c35f194c5f82bc3e7fa15171e5e8884a80f819c2f6e92620889e32

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