Malicious PDF — malware analysis report

Static analysis result for SHA-256 925d7971b0d16eaf…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 17:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fd19ab7882d01d12c9fd4b36f350a73 SHA-1: debf699452cf332995ec0ccb6248cd13a88a3ac8 SHA-256: 925d7971b0d16eafc2dad13846ba0fe089237acebff93d8d680c210178fc8651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to obfuscate malicious actions or redirect users. The document also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious payloads or lead to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://sibconsulting.com/contents/files/35858378384.pdf In PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/52570354189.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee922856f3---81155290187.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/kedikelevapojofekoxi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/masuzanuwadutob.pdfIn PDF document text
    • http://lulanjina.net/upload/files/xavisobusizuxobuxamivitub.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/bosowulazadir.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4df434f93---larilumopabozif.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/64213284314.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/34841813216.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe7ef5cd2e---risetiloxugiwaz.pdfIn PDF document text
    • http://saint-party.com/media/file/zawadusoxuwitipufipoxun.pdfIn PDF document text
    • http://yilip.net/userData/board/file/79535498336.pdfIn PDF document text
    • https://premium-house.uz/images/file/lurerununi.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/nitimikixakebipuwa.pdfIn PDF document text
    • http://qwerty.pl/_data/file/35943439950.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/20351892769.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/76203189300.pdfIn PDF document text
    • http://myslizdrave.com/soubory/bosarorabesijibanidopibu.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/45509107324.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/53316366168.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/50611386516.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a79d82cb6b0ceb0f60b08514b0973323/miluwazusopusafixemixotin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=something+beginning+with+yPDF 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_off0000d7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AB 17288 bytes
SHA-256: 294db94e9cedf2297c93e8e59e8c36e068d08ca38e57e9ca461e465d87aabf94
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 10496 bytes
SHA-256: e3d318b5d9639be0e4de21620aa270f5f191f3a0cf65b9702c803d11bd09dbda
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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