Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24d702fa88783ed…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 05:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75513ca791cf450bcde5e74c5bb37da7 SHA-1: e1e4384e4a26fb4d405337264e527db6407702a2 SHA-256: a24d702fa88783ed20f09ac9b64189a2cd9180fc64e96f44848266cd07259a06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect the user to phishing or malware download sites. The presence of embedded JS suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=among+us+download+link PDF link annotation
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/zolisorafi.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/fabubadaranepewewukejana.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/33184270171.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/33511691124.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/vomogikozefigiveto.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/kakizunovenimesofux.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613610872c0a2---vitidezuxeduluzowojaforun.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/bomunewilezelupofawi.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawajiduriwudojexawimi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ede608961d4b726d3bab9806fa8c98b4/jevolevupuz.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/wuwakibekolutapefapome.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gazavumazogasodopurek.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081429136011.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/ludirupubam.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/zukagat.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090614512898.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/94232784414.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/75743936652.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6e503474fa83ca1f6b587c87901fde32/tavatijitunutono.pdfIn PDF document text
    • https://maria-galland.ru/files/file/1065921245.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43378879486.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/59760455747.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_off0000cc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC22 17424 bytes
SHA-256: afa634df10a6690b8cee50e779866b7e222834533abe35eea80469ac53efd1b7
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 10520 bytes
SHA-256: c8724cf3ec595cf00c4cd608f61bc084aa833ced257cb0e518cd994584d5a43d

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