Malicious PDF — malware analysis report

Static analysis result for SHA-256 bda4839020ae4051…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 18:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2fc8134ad12e701766d86caec6bc204 SHA-1: 0b78098e0b06a8f88e47dbc0d56eebfa162ef031 SHA-256: bda4839020ae4051a6eb39bb09ff8a4d92af3db5d2d6a5f973d410b46b678f70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) indicates potential for malicious code execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=play+store+official+download PDF link annotation
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613960eaa4fd7---17925133529.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kirevo.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/63694138343.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/tolemexixeritadut.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/xunejowejitesedomi.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/55696162131.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/73970011849.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/naretip.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/noterix.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zezifomumawiluvasip.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/77476183081.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/82306491085.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/logurutasuriraxi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210901205342.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/nuvogepo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/53684089599.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/37960614509.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wunuvokewebosejelukazo.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130034c42029---89346079356.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15fec8dd0---35011247295.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/94072640475.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/guxunaporaramopubapajoken.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/79213789493.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_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 10668 bytes
SHA-256: bbe6211051fd0db4a0c0da2120f3e5b4da966dd2f56b4569a4751873dbc255fd
font_02_sfnt_off0000fe0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 16568 bytes
SHA-256: 6fcfd2a758a90ed6bd52cf91fa810af4dd051f6a3772216752f3993dc47f66b9