Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efa09f1b9045fe7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 05:32:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a044e989e6a2788e6048026fdea81381 SHA-1: 97b08f499d7045350c0d89c99722f94f04afc37e SHA-256: 8efa09f1b9045fe7c8b1e1758006f46b98e9eaf83718fa292683a4498322daaa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/40206263f91f3cceb7e463421bdea8b9/xekinetavon.pdf In PDF document text
    • http://gazetavk.ru/img/file/tarimipopujumifafebo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0989d56bb---xuzisedomo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/092ccbd96cfb9e17b39b594292ec4fe5/rogurawubilawusatuxo.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/zibowal.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0250791b---7281433959.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zegususugoleroj.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/51976846431.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pojem.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/52289232072.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/81480778677.pdfIn PDF document text
    • http://rld-carbon.ru/file/wafujikexanufaserakuno.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/patosop.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dbacee262---mamiguxolini.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af8397bdfc7---91946445661.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/77755329784.pdfIn PDF document text
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/72071699513.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/83e32a3e7164309b3e68f310b0cd55c7/jadatikojemaroxuw.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/zelaji.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730783a4331---tubanunopebalofow.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/47092443086.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609094bf9495b---93716744349.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/legebarutiw.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ol4rqvrd70p2vai5d2760oqce4/wufevuzeziduferi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=zener+%26+avalanche+breakdown+mechanism+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_off0000c9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 16360 bytes
SHA-256: ef31c5d14468c2e49ed2d160b0e4aab076aa7c169e09a47feb52c2b8c207215b
font_01_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD5 9372 bytes
SHA-256: 856645d41a231cb09ce90d4098b6a3c413569a2f44c9001c1f4a6c0c1e41e5ef

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