Malicious PDF — malware analysis report

Static analysis result for SHA-256 97226ada8b9afb30…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 05:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 971d6d66314bacc6283195eb9db3e3e6 SHA-1: 5c7613571defcbab93ae5a50ab734fb9b530939e SHA-256: 97226ada8b9afb30985172dba4fa8a60d8c42adf7bb1fce1a86d57d01d93c7d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=a+quiet+place+part+2+full+movie+online PDF link annotation
    • http://geoman.cz/data/file/5751326369.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210917034440.pdfIn PDF document text
    • https://mollis.rs/files/92787065827.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/6945650883.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/57336982592.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/28302835291.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/vijilikonex.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pedowu.pdfIn PDF document text
    • https://panama4d.com/contents/files/jujebigikopanatag.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zowakekekad.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/lotevezekivebememalet.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/lotepumexogozi.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/pesalolusixamexexugax.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42770f6bb---4997233181.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630535573.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/27ad2edde3eb3aa01207d9cb9fdb5648/sokovuwo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e236a0bfe---99609532745.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fabebar.pdfIn PDF document text
    • http://k1a.ru/images/files/file/87456609087.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/wuvokogaged.pdfIn PDF document text
    • http://generoussecurity.com/uploads/numiz.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/40821380629.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/90258351912.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431ac0f19cc---36959558592.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/58866782240.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_off0000b587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 16968 bytes
SHA-256: 9a3b0ee23d122c7b52e58bfe8da1b89f4ebd77e7d1884227cd20763aca70ef11
font_02_sfnt_off0000f911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF911 10884 bytes
SHA-256: b95c0715c7e396bc17444173553aca8b218b62f3d27f6bde94d80375a6ebf55c

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