Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5b0b38089265cd…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 08:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9f5d4350618035384730e0720f9ea91 SHA-1: 39bd574de717f82b32ff2b08c419301cbdfac59f SHA-256: ca5b0b38089265cd5833ff174cfad1d045020697d13cb52c7d8c024ce48e4239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these external links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link-based 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://drafthe.ru/uplcv?utm_term=download+quran+android PDF link annotation
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zujesagijeba.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/nisajonepidideribavesi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161345c9a4e60c---72343685530.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/tefobi.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/sosevokutojenez.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614061b47b218---lozuzofe.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/80513195087.pdfIn PDF document text
    • https://ibextrail.com/editor-images/mesowedasovugibedutoji.pdfIn PDF document text
    • http://elpijisystem.com/file/biluxasiguzu.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/xebezotarapotimatofa.pdfIn PDF document text
    • http://www.pvvc.cz/files/11745784189.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/25819941547.pdfIn PDF document text
    • https://digireg.gr/upload/84145995215.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/41020880373.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/tupuvibolipidufeji.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/rapijuzalogoliwirufe.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613673f3132fe---60550074517.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd951bc86---61076866440.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/suvotatipowutulonaz.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/28815212996.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/62452915921.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/finetizodijepagitusuluven.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/85071572257.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_off0000c33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33F 17764 bytes
SHA-256: 94a11d687a57bf60100e4f3b522135dbae1221dda5bbab0b96dbb464489983db
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10176 bytes
SHA-256: 9f746df5667b3a178845d8594096b0c1adc89e78e4aef974144e2c4ac2f61b5e
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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