Malicious PDF — malware analysis report

Static analysis result for SHA-256 979510d8798f63ce…

MALICIOUS

PDF

78.0 KB Created: 2021-10-01 17:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 573521b5f1dbd37b18118deea90c2716 SHA-1: e9f722561b6de58a3c569dd33287f8d6ba3d74a4 SHA-256: 979510d8798f63cece43a40887c79e754f2f7799b2a98db353e9f3a5024d8f6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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=goodman+and+gilman%27s+the+pharmacological+basis+of+therapeutics+latest+edition PDF link annotation
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d79355045c---70726994472.pdfIn PDF document text
    • https://petek.biz/resimler/files/benirosasaxebugor.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/libariduwipuropemag.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/fapirajedowolaxujiv.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/gizoraxewemexaw.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/92982564804.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614163d79b5b7---razerekamegofado.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/42660714698.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bozijajijode.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/48321297446.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/75594263855.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/64022369625.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480001a315b---pawev.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/55748170430.pdfIn PDF document text
    • https://priscar.com/documents/files/jejovajenaviwixen.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/75180446021.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/japowijiwuzoxexuvujabig.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/42786450062.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/66928597182.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/godikadalixoru.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/84420039430.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sosifib.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021092607460970554.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_off0000c22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 11380 bytes
SHA-256: d31664c1706f2e8baf10b309d6120329ee7b8a877448e24c739e472d7693f0b3
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 20404 bytes
SHA-256: 5e6a3cf2ec9ade57540b910c01a2c15bb7039e43ef6a7083f5060d15c9a65941
font_02_sfnt_off000111e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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