Malicious PDF — malware analysis report

Static analysis result for SHA-256 b955febe92398bdd…

MALICIOUS

PDF

87.0 KB Created: 2021-09-05 00:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 303cda1d144e89a8006f06bdc7a5c260 SHA-1: 1f6ca28f4bc7c2742761d8c5c733620029a0c9f8 SHA-256: b955febe92398bdd2c28b9cca794453c018fe3ee8db76a4c8aaf3fda11c58b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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=the+discoverers+boorstin+pdf PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a18f58b19---bujetiterepigotesawexu.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/ridakakesumenasiravuf.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/jaxutigexipe.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/11948058815.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/barokugijoga.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/boduzugulitafisinivawetat.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c1f47a3c---nofukoduwub.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/pixafefaruwi.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/66348383424.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/dakiwevodero.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160994fefb5cf5---bogexadijiso.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd71c377977---nokur.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/godapozalegutuwujogurowu.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/75232704204.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/42377793297.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/nojifotof.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/wikipukodunenonenamo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/fuvavinosol.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7481fe6a---zubulojozesinigozimenalez.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/25343358625.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/tonapedaku.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/58eb3030ee42455f45d038478f32e589/38095587747.pdfIn PDF document text
    • https://netpage.info/userfiles/file/devaziroperuzekeg.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/fa4f730234d13b7964eb847ff32804be/53449235678.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_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10676 bytes
SHA-256: 75ea5b36b6caece1f0f4ae6ad77016f85159c3fba25df972ef35605950d945aa
font_02_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 18176 bytes
SHA-256: e1996e3e9146ec0868d78fbf29711b732f47651c461c7da38f501f58e476fbb7

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