Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e84dcac4c02aa62…

MALICIOUS

PDF

75.2 KB Created: 2021-07-02 21:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1ecc5f933c1bc46daf9854e489c6d1f SHA-1: a1e8032642b0532ee1ed493dc91f13b5785330d4 SHA-256: 4e84dcac4c02aa62c540e089907aebad24425da73a9246177988ce35fd201597
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://goref.ru/files/file/zusoxazatigenegopo.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/khm5l3ae9puvqa7npl95pe1jn7/mexagegurigukupib.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4ea6a0a2---xarerotomivojuxidix.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/i2vick55hhp5v0vp05inqfl9p4/34248494712.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/gogojojavavewosax.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26baf6b127---74990312419.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/juxanuloxudar.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/16042684843.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22355cd3b8---38338736839.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/bolelojo.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/85446286895.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00b6d6ed4---jugubib.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/39877267456.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8082d0c80---gisaj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k5m5ea3eeb103ibocobrvhu7je/46974485693.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/48512835828.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/popunuzuworimuta.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160959f6d8d2e8---repumuto.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce3fa10c98---11580226185.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/t6kqllqg87ciiuv70920tqlh60/figedivutibogunizane.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/14313358074.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870ae283893---47170858297.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16099af74081ae---sewafugogovugekevupajoju.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad55265e5040a1ed1e1d6df36b4fad21/tojavopufeligumos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kaeson+youth+parkPDF link annotation
    • 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_off0000c400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC400 10508 bytes
SHA-256: 8a3610dc5fd97a9afc24bc1e99c93375fa1812cd338640cb85fdaa68cef65d74
font_01_sfnt_off0000dbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBED 16268 bytes
SHA-256: d3caac3ea346447cd9fbf0e41fafc8467ad38df8267902927b779c739be504e1
font_02_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1