Malicious PDF — malware analysis report

Static analysis result for SHA-256 56773b1a6ae3b1c4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 15:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d999f3517748485e57da46be5558f567 SHA-1: 763d9adb26988dae2d724febe3ae0c448f660359 SHA-256: 56773b1a6ae3b1c4b09421c6da2736e12c109d6630654fdf65b234ce5b55ed54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://catamma.ru/uplcv?utm_term=magic+sound+for+call+apk PDF link annotation
    • http://caytrong.vn/Images_upload/files/vafusutelosusasilasat.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/11209700038.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/81781878257.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/sulaxegatukijozam.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/89788483450.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/50047163741.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/rukuwodefajuwom.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/48373922812.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/55423204712.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tudadezo.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138870a27886---74061957700.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/66027107443.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59b8e3a80---nukuwavenewolopu.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pusafidafimefak.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135c0437adfb---bikojivepibofalojiw.pdfIn PDF document text
    • http://clingac.com/d/files/julafuvetivusizun.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/tebizenidekeripavokaxe.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xoxapodiku.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134befd54c13---8753008682.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/mifolarizulalodiluf.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/juwameniwukufi.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/75781851487.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/47183588253.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/23316002203.pdfIn PDF document text
    • http://imbirimbir.ru/files/gidopepitepur.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/72311428045.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/nodolitifonetosu.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_off0000d7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 20172 bytes
SHA-256: 766b5a375fbe38024b5b5f75e32d5534e8d2351c237f259a2fc22a9bd2713de8
font_01_sfnt_off00010c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12472 10748 bytes
SHA-256: 16e81f86fa9a7c05f99ddc0efc53097dd52ba51bb22680f8f5b110e01d0614b4

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