Malicious PDF — malware analysis report

Static analysis result for SHA-256 e464b5311f583ed4…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 21:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60c5a5e848e7c4e5443cda638150a8f9 SHA-1: 7e9dce0f20782e86350e37d39c891c03305dd383 SHA-256: e464b5311f583ed4f7ba2d33fb733581cf16b0ef31bf0500fd477ccdd3f77fe6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=browning+buck+mark+pistol+manual PDF link annotation
    • https://bettyloupaints.com/userfiles/files/6013325847.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed3a4uo3bkum2fkqrgq5253mvr/33512600160.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9933b5fcd1---dagebageluzizaximoz.pdfIn PDF document text
    • http://www.moyekolodin.com/files/fenasanupipasaxemudi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/69679785729.pdfIn PDF document text
    • https://akemi.ro/hirek/file/56203253187.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0a8b21068db5aff6d24efa28883362cd/kexegofopos.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/mogev.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/xaperavolobudozamufis.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ginl7a9agp8hdo2t1t7d9l2ih0/40401826964.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/sadaz.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/zipovenudilitowezadotoli.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e57e28acf0---60617913979.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/jifibugalinilofi.pdfIn PDF document text
    • http://alkanboya.com/files/file///40851526450.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/16476656671.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/49901188139.pdfIn PDF document text
    • http://goref.ru/files/file/bepuzulefaronozuf.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4622811d3f---mixubaxowo.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/lujazavetijenavifob.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ce91e3dea---jatazi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6944a9ff---tafaragogemi.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/44648575435.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/pimavazajiz.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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 15940 bytes
SHA-256: bcf0b8ca8ffe5170cf3a07c686ba5bc1033e24684846d292483fd8a1c1d59ebd
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 11056 bytes
SHA-256: b2287b9061abfed45f31967cb87e3664bc9e8866aef951ff1a2d76ec8aabfb67
font_02_sfnt_off0000fe0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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