Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1019068b4362fb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 21:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1599f2b63eb6008cd2d1315d7460646e SHA-1: 0626f0a76310b3b66b547cfc9fad5acd5adc7ec3 SHA-256: ca1019068b4362fb0e8b7fd40cf52d3de8faf3b97f29e34d9d7149868f083a3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a variety of websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=akashic+records+pdf PDF link annotation
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/lelotove.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bcd31bee---89692518912.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/90393334692.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/52700714229.pdfIn PDF document text
    • http://jfe.hk/userfiles/vevawevozuvesurikexub.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/19092125974.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614007d4b9b29---dokepeduwepiderowuvuba.pdfIn PDF document text
    • http://wmu24.ru/media/file/nugozefosegexexamojunil.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c03b73e643268b8c96f76a96f8e5662/24454435188.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/nawikow.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/61690865668.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ffdb9728f---xogonitonejikesisap.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2eb88a68---suxuzipifititefoduto.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/jotovasele.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/buxirefimowo.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/timipolutetajoloxudinom.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8ef0d8cd676bb166d1723e28387b6a78/firisuwov.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/buxil.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/mutaxolugivaxavirejofawil.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135122196957---39295844215.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16134a91b2d84c---vomepumotalepufupixap.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316978b237a---gibadufafaxakujerixazu.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_off0000d822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD822 17632 bytes
SHA-256: 3a4e84a927daf5f310e43103d7a8426605f1ec65036c3118d13286a93b5b558f
font_01_sfnt_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 10540 bytes
SHA-256: 2f25a9a74d868a74c8a8874059ae47d89d55eb355b423fd6170c27e739f56f19
font_02_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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