Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ae388548006f98…

MALICIOUS

PDF

101.1 KB Created: 2021-06-29 02:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 34fdfae4fd158aa5c52c75df15bd1b19 SHA-1: 273527e3ccf9c165688fb9e0b11a3844adee8b13 SHA-256: d9ae388548006f98e5b7ff459534cabeabb3c95818b79de45c30dee99084b6f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9787

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://davaocarrental.com/images/file/68242162137.pdf In PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/54332495350.pdfIn PDF document text
    • https://educhina.mn/editor/files/suzexokig.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lahr823qh8rhpj7ighcftmkbdm/11244205378.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d533752b466---lexugowebavuvetefanag.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/6768307790.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/todadewepupivi.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/12163220923.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/34198705612.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b5451b2f---suvawulabuxapuno.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/v4n1rtbivd34t2qbkdbjq6mar2/32933065020.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/7e3785f2ad7b94c9b54af322287207f3/23543330567.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/9939623292.pdfIn PDF document text
    • http://allycatering.com/userfiles/rewezeleluxibax.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16087d89f79743---19379650372.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607735348e18e---11307199988.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/edcjq9s87llc3lr8jfpec844or/95414272547.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/75edd920c29f18c1051720d001f7d095/14839234980.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wozuzegorelanebewibatase.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/xevimejeme.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfd3b0038---libiwelanugefabanow.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c285e3e370c---87254225995.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a0da0db44f0d071302299552fd1dfe4b/kudolupunegafewixokave.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729b8e72862---wunafo.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdbb36286---dejudomalarinoxogef.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/kevudow.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/8759856473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=litany+blessed+motherPDF 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_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA7 18548 bytes
SHA-256: 7b1e4832f470200cb90781220df0b2801fa53016a43da0a5de4a09ad6844d4f0
font_02_sfnt_off00016e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8C 10724 bytes
SHA-256: 1c256731d9c8964fb05b9ec4d4b1c7e304627b543ba20f0a7a521e9d6fc03314