Malicious PDF — malware analysis report

Static analysis result for SHA-256 879cc14796f2bbaf…

MALICIOUS

PDF

84.1 KB Created: 2021-09-23 08:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 23107a27b1b91e78f888e5e7a89f86ea SHA-1: 91200da2e55b986eac52237fb401aa2e5ec04451 SHA-256: 879cc14796f2bbaf65263a451f5006044a36d200baa4bd200447f0e0cf8959e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=followers+gallery+mod+apk+download PDF link annotation
    • https://palezieux.com/ckfinder/userfiles/files/jafedepupurirojukira.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/37615757453.pdfIn PDF document text
    • http://showdoimovel.com/files/files/zuzaligazinik.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a448cc9cbb---fitikifogari.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/dututazexagaso.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/15410527643.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/rizebakusanukeze.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210919112217_868725244.pdfIn PDF document text
    • http://synowka.pl/galeria/file/33125701010.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8e971d9f---soxolimej.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/71221673799.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413945cf2f6---48565157619.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/wuwedelamazubatubapalaku.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/voduxasizo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/10dbf7aa77caf1ab6c67d433efd1bafb/juwifabejeti.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kukugojaburagugowotepeg.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/xopopitogajedinavenesigu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/afa0ct43djjhv2udvtop3vq6v0/siziropusoxirixudis.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425f3b1c385---42515833187.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/rovakizewagoxomuturulir.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/32269184834.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/24414934303.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/jumevop.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/peguxefasevobimedetep.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/81256343008.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_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 18032 bytes
SHA-256: da07af4198efb38c52da0ff85976bfa3136f55d53145bc0ce23294a5c9f8e6a2
font_02_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 10812 bytes
SHA-256: b8f954a2087212352082445bedc465e83390e39c6b6f7145c3a2db3acfd1ab6d

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