Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ad1a5eb7c1c7f5…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 17:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f502b9b095b5dd31c5590942de51d1e SHA-1: f7588a3bb875e9a294e189b94f3d984030323701 SHA-256: b4ad1a5eb7c1c7f508f4ec5e730e3f3bee94ed9c8045438637145f0b2ffd658a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pixomot.ru/uplcv?utm_term=who+surgical+safety+checklist+2019+pdf PDF link annotation
    • http://cedule-plachty.cz/files/file/jipiragedazetulaf.pdfIn PDF document text
    • http://kfbi.ru/content/file/258399816.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/49757408612.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/86509613052.pdfIn PDF document text
    • https://agros.net/uploads/file/52883256793.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/3503167994.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/lotafapikiv.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d98be104a---57129625262.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/15954426805.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aee2e191892f49b98997888e67d6ce5/sujixetigivuk.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/30923194403.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/75669472065.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5cd39314d48826809dd0ec7e89f151c1/fiwotepejizenum.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096f9cc43779---sixamadejemitujoputir.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/26304327107.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d455b22420---nidoretilosik.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c31a8908ef4---xinafexazapavupagu.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/71402476690.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/95594105154.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64446234760.pdfIn PDF document text
    • https://norservis.com/files/files/8278055573.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3131d30e03---xalegibajegirum.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab119a6a933---rumusuwutufokibagi.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/loworow.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e234d8e0b8c2c7176407da273ccc4a43/11682581715.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/765e2d0b5682ff6d9fbe436807b7165c/nivob.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_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 11556 bytes
SHA-256: 307001a3c61677fb463291187b835baa1c1c675dc1b1c28d74b19ea19da46ccc
font_01_sfnt_off00011a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AD 17636 bytes
SHA-256: f2ad9c481a6df6e43f8cdeb41411d33237324d31e07ddbc835df61e851714aa1

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