Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eda27f9cb39047…

MALICIOUS

PDF

94.7 KB Created: 2021-08-08 11:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae1dbdc8d244dc10533d9f73328589b1 SHA-1: 7cf3ba41731b60eec22fe8e41591c2f5dfc8dcd9 SHA-256: b8eda27f9cb3904767171715bc5ca50b56f3ad51c6617b6533321c5fba7c7f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://moto-trend.cz/public/files/fck/file/janaritejutazuvew.pdf In PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/vajovinawopaleso.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/gipumiwana.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/xufap.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609074ac136b7---22969453560.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d707638ed70---kapinikezigupigan.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c441002792---nezadolutadukuv.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b9322c66f---25681147834.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03a282170---22031757155.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10c7e940f---9389312795.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/74975736181.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/67f467c1d7cd7c0b49a7140baf470de3/5743888637.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/dumafizegimizowu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/37123029034.pdfIn PDF document text
    • https://domilot.com/uploader/files/nixikakaset.pdfIn PDF document text
    • http://merwepizza.com/upload/file/poxewiwadim.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/nolaguna.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c00c8de9b2---kufenagazila.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b2628a047922f805195d027e6ec5a9b9/61942410250.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/78901105465.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/70229052629.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/xebojelubosegekam.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/eo9293kamrl5lc6evphjj5c4k1/supujasosisopaxiwunoxebeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=critter+air-powered+spray+gun+reviewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_01_sfnt_off00010d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9C 17232 bytes
SHA-256: 9e3e1870be67bb4d1655410e607688f2cb73c65e4d55b1ae8607851cf8e66977
font_02_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 10952 bytes
SHA-256: edd7f58506f27172da302fdf8b9499a5d5067f7d33c60e8128bcb6e7197e1aed
font_03_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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