Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b01970975a07472…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 19:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1f34f726a5d1d22c9d189b54db1aadc6 SHA-1: 6cd2feac3ca46c42657dbc1815bbf2f9cda0fcd3 SHA-256: 9b01970975a0747279588340dc8fd77b427145020474d894650551de3e37ef7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ourdesign.hk/ckfinder/userfiles/files/movarajogut.pdf In PDF document text
    • http://mgocsm.in/userfiles/file/57230866390.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/vuxojosowug.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628441139_e842c2a012.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43404e272---30881476898.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/11664183272.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/2792518222.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2vagceo77umgkrsv255litvhci/xojevilabudojijariduladu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/zuvupezene.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d84dbfd14---kokozasexix.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/dezupomemavafakuwafeji.pdfIn PDF document text
    • http://starsunited.at/upload/files/94976519925.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/88000046827.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mfb7ff94bq1jnceojot56m4lcb/wixewotugipujakapilu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f0e93cf11fc9c8aaf4dcc5f8f7245412/nitito.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a5a8a75a---18615370856.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/tosubofufo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c01edaea2---12771203128.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/49435679118.pdfIn PDF document text
    • https://htchninc.com/d/files/15744555252.pdfIn PDF document text
    • https://techlan.pl/files/file/jalirejabokelopimuwopena.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/4865323659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=multifunctional+furniture+pdfPDF 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_off0000ca12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 17480 bytes
SHA-256: c21c6d858a0487b913c70b6107332da2e49d8a377ff48df4cb719dad5d84ff6d
font_02_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10540 bytes
SHA-256: 1927e0ae719a9b178e7fe6ce2a21ff98dff95a8af45dd42a9cd8be0393435327

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