Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad14d10178fa5edd…

MALICIOUS

PDF

89.5 KB Created: 2021-08-19 23:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4d4ece4ad0bb8723d4fc63bd41353e8e SHA-1: ac436652845e9e94afc83a4575b09e474635e7b6 SHA-256: ad14d10178fa5edd97668008c253d8058eb9adcdaa769695fdcbd00b8b65da86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mn-lawfirm.com/box/userfiles/file/piwuz.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106287e9a261---71328125372.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d2daa9e924ab3c218feace6acc734a1/99492401414.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/71586789695.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/namemamuviwukododag.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/nvqu1edadt73qkg64s0rbqq760/17842569805.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e474bdfd6---wajixok.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088357dabf31---zoforatasi.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ladadoda.pdfIn PDF document text
    • http://flexa.cz/docs/file/2530861593.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2710f99d810d797102e990a765ec1d97/faxawoxawovavilineluzomu.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/38912049770.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ffaaa7269f1---45732896802.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b5aacbe---mogivawunogexabukaxuxeme.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/99293678963.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/jedazitakodanowowozufuv.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160995f9f38889---89713275649.pdfIn PDF document text
    • http://farmina.ru/uploads/files/77823755481.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607750893ba99---12951889459.pdfIn PDF document text
    • https://jetaime-shop.com/files/nagum.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/13395632402.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/9039046337.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/wafejofuwifitulotarowib.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/12184145706.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/24035999233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=overstory+richard+powers+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 11008 bytes
SHA-256: 289c350c1b74584a71a37730cbc3d03107f94f12ade1b706dec4c4339e8f6680
font_01_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 17012 bytes
SHA-256: f40b2c92fb3b5eb33072d9b8061c184abeb1a2130d9269df9ea9901cd99904a1
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1