Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cee830da618b2bf…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 13:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3485017797cec6e7b0ef0430443abc45 SHA-1: 7b4c105dd9e04f45cce1be82900a0ee94c2a3a54 SHA-256: 7cee830da618b2bf687b2e3a27c583c0a36dd3b4400df30e9ec15a0c77cc8308
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external links, including one pointing to a compromised WordPress upload directory. The presence of a visual download button lure suggests an attempt to trick the user into downloading a payload. The embedded JavaScript likely facilitates the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=hotstar+vip+free+download+mod+apk PDF link annotation
    • http://nacyc.jp/Upload/file/jeloko.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0ae6d1775dc6b7336be858f4f3a58407/lawubikibuxa.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jidalula.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/doduxalas.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/vujim.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/firebozezujosokafibinulix.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/61381715561.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/74800991271.pdfIn PDF document text
    • https://abcspain.tansis.com/userfiles/file/betoratujijubinelemijiw.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/74345873377.pdfIn PDF document text
    • http://centrons.com/uploaded/file/559479553613cfd24db7b3.pdfIn PDF document text
    • http://mastervin.ru/files/file/78038686041.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/padukaxelesuwejezovat.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631317073361174552.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/45840384889.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/59118088259.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/uqd7u8i6fq4ei59nmgib87hanh/90819434142.pdfIn PDF document text
    • https://termoformat.md/img/files/sebibare.pdfIn PDF document text
    • http://nineslash.com/user_file/file/2332860515.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b8f3681b83f86b3186bdcd91fab86eb8/vuriveguxogolurexobifa.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/jaxedizalopoka.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/lizovanosaja.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6795011886.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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10892 bytes
SHA-256: 7547503d8a0d151f45cd8689cd0b126961ffac2a5eaebf632e778a19cf8a5955
font_02_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 16920 bytes
SHA-256: 2a452cf8d1d8ab9ea7166050af58434bc0bc7cfef6b42bf0220f1e6029de760d

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