Malicious PDF — malware analysis report

Static analysis result for SHA-256 510406d126d31c77…

MALICIOUS

PDF

78.8 KB Created: 2021-08-19 22:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 615a2409c534e82ae9cc778c29570d4d SHA-1: 998edf6885a2e8d433b08f2f686120744c3688a0 SHA-256: 510406d126d31c77e24130e837434dc357c8cd014a3026968e007f4d358113e5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=dashing+cm+bharat+movie+download+filmymeet PDF link annotation
    • http://hainfelderteich.at/rapijiranixuvozul.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcd67aff24---jipitumusi.pdfIn PDF document text
    • http://whatdwellswithin.com/file/78815963613.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7b610dbdf51c2f0702b84d973b52d17a/82571699299.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/rugawewiluv.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vo8rbqblg5fj1almsbi8089p4s/lotinojavanazikuferesofot.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/mivovezebexili.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/47367979367.pdfIn PDF document text
    • https://edusfera.pl/upload/file/92346841371.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903eab8a9b7---satawogeg.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e900877e44910db2ef024428ac19f7c0/4752153071.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/bejufipuminozitapove.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/97971192635.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqjoaidqbn3jera5fp1r2qi7q6/50700846095.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/reriberetixuzoziki.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3ffc8feae0ed72684e82f72039c1c2b0/jalekov.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/9cq5t9ke1hdamur7jrho4hg3vk/73444847713.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90202d8aac---boruzogabubo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jagepotipafikewas.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/601f1e31feaa1c5c695e46deea06666d/25223189279.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f256555b6c2---texufujemivinexurox.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b03a3696---zuxibidabowurifo.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/pugadupa.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/dafuradis.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8acc15aec---84658433027.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_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 11332 bytes
SHA-256: 8ee9efdc79e149b3bebb095b4b9a92d084a7b675b9a9655611f9a833772c848c
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16488 bytes
SHA-256: 7600d1c376fe4848ac6861e2182473f42e6bb3b7446e9c6b165e8b018df18abc