Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5cb65c2e57f6b5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 18:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aac5fd0ff05fc51324fe0c1fa3e694d1 SHA-1: 0e5db9692573dd6aae245fb1b459259cd2662c16 SHA-256: ee5cb65c2e57f6b5f041caa16f60f6e3ed3d801c03ce21766d0782bd56c0bdbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially to download further payloads or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=financial+follow+up+report+format+pdf PDF link annotation
    • http://infinity-pro.ru/userfiles/file/ludunerijufa.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/29486328356.pdfIn PDF document text
    • http://chapelguild.com/images/usr/9745524639.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/21615276748.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/loviwawobu.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/wotesedowubutezobawogawi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91923d62d---tazisunef.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/72593246106.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/palavefopojel.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/42d35c66e49fcb192a015b415a6038a2/zilusal.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1b8a1d651---fidijawubanapapimanuxu.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec3e5eb8a2953114b95e522aba8f036/96141950097.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/k43i3gre1mscrolja49bplf5o3/33885148074.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/kiveduxawobilifimi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/dizanulavuxume.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fc25e840d0a6c0bedcedfeaa6a0ded61/59330682439.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/tolomuk.pdfIn PDF document text
    • http://keacg.com/upload/files/foroferikikofope.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/87360439519.pdfIn PDF document text
    • https://haidangpc.com/contents/files/bokatovegosudipux.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16307814261034693775.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854b326e369---8942870898.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8889teai0ulcqo65769dfkjkq3/kezodaginemovasesomako.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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 10776 bytes
SHA-256: 26b9730f420c351039412e7eb130b42e6fd9b062cb0fc3a20a5a8d0a702f162e
font_01_sfnt_off0000f717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 19524 bytes
SHA-256: 43e92376a132b79cc3960c219ee3556ed9159330a17c9cc49d6b23148f66f21a

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