Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c6f2269dc39da9…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 19:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 90a691e21000c0422aba17032d9e318c SHA-1: 5644bbd2b20b56dd28b4108c136a00cb9091b035 SHA-256: 95c6f2269dc39da9568fdd481034aa38e204c52de62d45c78a625f5e303ebbec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=best+free+pdf+file+size+reducer PDF link annotation
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/727546e3f011d2fa2e24c29118b24c7c/figolikegezisavixami.pdfIn PDF document text
    • https://activepymes.com/pub/file/faravetowadimikokisalu.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/varifudevipoza.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/27548838e9d27f080ede9a7ce5b3bda7/82272392514.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca82be6dab5---woxuwev.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da400384177---6164939944.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/7a0d0afda31f8ea2248f2afacb8dc7d0/8980421091.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e0621c31cd4a173eb8f1c82de4ce4aa4/21905611318.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/belezamazibenugolas.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160724760ba9f4---45310789018.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/t0250d77ju8b0l0c0jhok9loa2/wupenovefobimubebonusuril.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579e0b8e42---55385690800.pdfIn PDF document text
    • https://lapiadinafelice.it/file/35906799031.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/medugomakiguditomilikan.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8312c2c04---dadajoxagujuzidowazibutok.pdfIn PDF document text
    • http://sbairs.com/datas/files/37988542824.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/luvezesagip.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/82817135404.pdfIn PDF document text
    • http://accronline.com/userfiles/file/posulalapiratuwadawajupil.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072a21cd78ab---53067157376.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/waxosototesipoz.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/16778942882.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/sepiju.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608755d986290---86223463650.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_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10440 bytes
SHA-256: ccb8c0f55f805633bda57ba5000930cb8083fa4f1d0d74e560652a9b153f2960
font_01_sfnt_off000111f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F7 17352 bytes
SHA-256: b801515bc7eb5d806125737e28e4be64e2a416a97f6c89b6a746774039a2ad74
font_02_sfnt_off00013f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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