Malicious PDF — malware analysis report

Static analysis result for SHA-256 8beb6c7455b1d4af…

MALICIOUS

PDF

76.2 KB Created: 2021-09-24 16:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd08e9e3a28525d9a6945b25db3dadb3 SHA-1: b8d5b56c1b974d3c975a22e52035508a6aab8961 SHA-256: 8beb6c7455b1d4af979b224f127f2ddf9345f526e78fbf573ef3eff79319453b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yenhuy.vn/upload/files/43121867622.pdf In PDF document text
    • https://shibbirs.com/media/files/47914822270.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/98276463082.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/21547739597.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/89298fbbe1e5fa1743283a2c6a884734/73552854078.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/sumis.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148a77221fb4---mutemutagobo.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/sekiwavune.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/ponuxupazejubake.pdfIn PDF document text
    • http://wych123.com/upload/files/patejiw.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xudekodipe.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/8388910669.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/51841230373.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/13534560374.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/93520771412.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/96022516501.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/lefapisifetamonufojiwit.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/lonazijilumuzif.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/putexufilezinovazixuwireg.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/71528505559.pdfIn PDF document text
    • http://leton.pl/userfiles/file/fisopejezejugumoxene.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/fanikufemarerixivaxo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140b96555cab---meludolimijuwadet.pdfIn PDF document text
    • http://i-physiology.ru/upload/joxidodafexezejemuxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=castle+in+the+air+diana+wynne+jones+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_off0000c06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06A 18708 bytes
SHA-256: e5b20d7b2cd760a3caea6c93b8a38ba2117406b1c40b8915e2290eaa1feded94
font_01_sfnt_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 10956 bytes
SHA-256: 7536c261ac3a42baf7bca46766332a3de03d9bee866cf0f0e0915b95d78a0aad

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