Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d038b7b0c40dcdf…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 01:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9aad8869902285930277f8bebb9b61c SHA-1: d4fe1d4843efce142f27b8eb8f62d76a3504001f SHA-256: 4d038b7b0c40dcdfbb332db1bb77391b031fa54059995e44bdeb6fc60e8101f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a link farm hosted on compromised WordPress upload directories. The file likely serves as a lure to direct users to malicious websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=netters+anatomy+colouring+book+pdf PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4704cb0d6---fumexapomajufanaliguxu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11f2c7157c---68475577869.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160753e2b7d3cc---43672533729.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/fagikimuxo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8bba4dba6---nelaxubip.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/xabazizarivexelaxubig.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0d0bce63---34173770853.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/31102505960.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/56498053721.pdfIn PDF document text
    • http://maihome.hu/admin1/file/zixiwoxipikotojegawite.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ohjkv6d1t875obthrj8ap9tq6o/podegazapuziwelurusan.pdfIn PDF document text
    • http://winso.tw/userfiles/file/gitarano.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/92437749717.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/07f759b1f8476f7131b44d8168560143/38037430273.pdfIn PDF document text
    • http://tochuchoinghi.org/files/85509173939.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/57215363996.pdfIn PDF document text
    • https://faprosid.com/file/rumobiwipopi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/57283368693.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb673c23cc---dorat.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/47689861598.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3b18389864a855a6a5780f0aa02b470b/rujekupowoxufetekuv.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/8eklni61jnhnj65ne08631ha9i/76296481582.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782520db8e---73884670449.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/j9303qmrtjvba4k14cu7qqos6o/zowavurabijipojetema.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/falelitukifetutegefurebiz.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_off0000c28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28B 17760 bytes
SHA-256: 726b695aefed97a70d68a204648107692b08966e465e76e5e3eb2f443a26e307
font_01_sfnt_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 11388 bytes
SHA-256: 36e01001d2dfc0973a94a93213fedcd267a2aea2fa382189df57c2f0539aee7c
font_02_sfnt_off00010a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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