Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f8188d9a86966a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-05 06:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37d2ba5fb6aa252dee0b786e52128d51 SHA-1: 5c2e1ed4ccf05bc9206b986e01a6e37dd7cb9b8f SHA-256: b5f8188d9a86966a4f72b592e04d2d8c05e8023b3edcfc650de884105507b395
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress installations or disposable hosting, indicating a potential for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=yaesu+ft-450+manuale+in+italiano PDF link annotation
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/87974216418.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a606c9720---buzoroxi.pdfIn PDF document text
    • https://clinicscrm.com/img/files/demekafulifogoxawe.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/60180041666.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/29ebe6891fe910ac8ab8a8759e66c3f9/87940022687.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ec785ab---lujasowamujumagajiz.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/70862078525.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e3ba85aa7---kuxinekonopokilol.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/porejuzelipabakofovuxu.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/xafufujupefozalipu.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/xasad.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/28909826740.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/vubetexegotefexerulikixel.pdfIn PDF document text
    • https://le27.fr/docs/file/54750456943.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65878125888.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vatifov.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/45009722952.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/moxiwutiduvotezedugej.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a8561f145---85718603388.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/nuxamitijajipag.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xuboxusagorosadobibogo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a26949c55---37034437453.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3ba3dd875---18970217413.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/52324443863.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_off0000d10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10F 17084 bytes
SHA-256: aa78456d2a75803a1dfc2997f75b7ee2dd055ccb0d1fb6ce427355621b5ce75e
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11571 10728 bytes
SHA-256: 4e033ece54fbb442a3cbfdad060d2a17da9748105eb9394319711c60e8302929

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