Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76392415dcb4b62…

MALICIOUS

PDF

84.7 KB Created: 2021-09-06 00:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a1fc89964230a9b1e7c5ead3a09ea15 SHA-1: 97e223e4add758dc4cd319933faed69d4eed5bbc SHA-256: a76392415dcb4b62688a89834c240dfd4823848b59fe754f4104f86dc2a4b20c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/50b68bd4da6cf7c580edd0aed456c0e6/sidafonam.pdf In PDF document text
    • http://aj-logistics.com/stock/userfiles/file/55840911454.pdfIn PDF document text
    • http://allycatering.com/userfiles/7796345554.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/soloma.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118509780c13---xanaduxikavovav.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608547eaa6094---gepugem.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115e0bbe7e8f---73430235064.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/4200605001.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/mosenirefemugilunetipelom.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa0fae872---37391862495.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/wasixorasemomesewewosuro.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/kesazirupuzekegup.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/afc1s19ldksritub2o6923th0e/jutolavufalaluponad.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/83001780127.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/19619245484.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/dea23d0218bed812aacaaf2684150a02/46131195962.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/wutisaxakolavibuva.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/gonutovomodebafe.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/78193378482.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4a4bd2da---35176463511.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/80201021954.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0108c97f08---37022811834.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/19584796067.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/89200393541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shuzo+fujimoto+book+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_off0000e53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53D 18268 bytes
SHA-256: d8be2488e408b43d7c977bfc5754646a4d130c89d68689bb0f84892e26a3a878
font_01_sfnt_off00011488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 10648 bytes
SHA-256: 5933d24aae560b642220fccecb392dec2f7a0189f42ef2f697b27e98e0a4dd04
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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