Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55be2533eba2207…

MALICIOUS

PDF

87.1 KB Created: 2021-09-05 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82fe65ba0acee441dfe090bb18b601d5 SHA-1: 5eb46763e5c40525327a95b0092899d521af78b7 SHA-256: a55be2533eba220731c97c340e1a1be9b49fe3f5ae6608abbf31d22feb46f89e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains embedded JavaScript and numerous links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicate a tactic of using compromised or disposable hosting for link farms, likely to obscure the ultimate destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160704c4cdfb24---wesotisigolefenabas.pdf In PDF document text
    • https://ukmalayalamnews.com/userfiles/file/34346380378.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e8e60f4ca---moruvenulewupa.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/totajodateloter.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/jafufokubofefum.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/cc97849a9f55e41cfed25cd67fde6a53/luwekarepaboxijodadevawun.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/56121648610.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/raxusavozejotabo.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/orb3c4smqejcol6aa20v2svpcm/69142914022.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/bogejemurag.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/86300051625.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gexowikarulafetesavafa.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210602224842.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/komexuxomulibuwagekixa.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/4469842120.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/7133290880.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/31151318858.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/samurisuzamizazenuwin.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/24021233840.pdfIn PDF document text
    • http://sam-global.info/files/file/nowopujejijujafirir.pdfIn PDF document text
    • http://forti.in/userfiles/file/21877649544.pdfIn PDF document text
    • http://anm-av.de/uploads/files/lodakujobununu.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/digubozomirebu.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/46476312972.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/kusoxitofodokilulebuwen.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e3254f6bd---60427509825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=methodologies+of+art+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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 18876 bytes
SHA-256: f5297c0a0e651c3ff600407a118f6380adccaa083da60284abea7bd2dbb44193
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 10668 bytes
SHA-256: 3e54224b0e376b7d2126dddd480afc126b995bcacb3f8e39355d7aabf8c44742

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