Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88e4a9c10e3fb18…

MALICIOUS

PDF

105.7 KB Created: 2021-09-03 21:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 83585a60b4c37015aec0c8024882d6d1 SHA-1: ea9ca8fbd049ca5430ff62cf0e17f4cd613c39ff SHA-256: a88e4a9c10e3fb1833753355340b210f4eea1678fef82e6ccf296348d797526b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation, likely to direct users to malicious or phishing sites. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=modele+certificat+de+travail+2018+pdf PDF link annotation
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7222b8a281---94589459126.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/20004984744.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/bavilis.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/duxot.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/vexusedewajizumokunix.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb834f6c8---17490010038.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161167c7b28029---93618897026.pdfIn PDF document text
    • https://digireg.cn/upload/lavexixixamubiburopag.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jarozifabubaxuzewuneket.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/57623341264.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a663e5af2b---89755179694.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7317e0b070dc1efb986976b375d9c4f8/bizixu.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/743dc8bae17da5019be7d63ba5efbd5a/kebuxab.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021061395537_712727934.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160877863c2164---72474348108.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/77536161282.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/18245251215.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c6c3996ae---konipo.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6aa85dfff66cdc592293db3a49547387/mavovewilenebevokupeg.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/72107b889576e312eb3b7951cdaee2a6/37440615139.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb22411f620---66204692082.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/ribodufatot.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ffb530c59---dajodugasudafetekobozu.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/rusizuwugukogij.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/nolovimud.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/potexozakikuzefagan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC8 21764 bytes
SHA-256: feea44d091b08841bd782db3043ec923833b0e8206ef12124477a793605cb094
font_02_sfnt_off00016292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16292 17624 bytes
SHA-256: d64864dd0dd8721386482a900ccf34ac279ec08b1f2b0be3f76ca6b8447c6f39
font_03_sfnt_off00017d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5A 10900 bytes
SHA-256: 0077da382828bff9372865226732f44aa5f22afdcfc3736f332f2b8edea8fc62

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