Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5112eb90f233050…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 08:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 205949c688f24b24e7fbb35f2742a5d5 SHA-1: bb42d2c3e727ccb3797f4b436df078f628796277 SHA-256: f5112eb90f233050bc0cb0549dd1c065773a4525b06ad9247c9a60be40cd11ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The sample also features numerous links pointing to compromised WordPress sites, specifically within upload directories, indicating a likely phishing or malware distribution scheme. ClamAV and ML classifiers strongly indicate maliciousness, with the embedded JavaScript likely serving to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613506219fa0c---91223870240.pdf In PDF document text
    • http://safeabortionnepal.com/userfiles/file/perunune.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-26/images/files/suvuji.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbefcddc93---diwigiwuvak.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/80397644265.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/nepapimukoruvagojokorat.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/98750236027.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/43371406749.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/76009216286.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ximokomamuxaw.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/sajewagolukak.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/kedorovupid.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/bulav.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/71260163318.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/61824615095.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/47777486586.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/77854564765.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/taneku.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614652b97c579---11136607948.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/44504928036.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/56550056273.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/82705849126.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95d36e69f6fa522be6b98f44f343f8f1/kisisegojijoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mirroring+via+usbPDF 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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 15380 bytes
SHA-256: 3e3d1be60d9d25c3fc213fb2071f09ccd7f7761c608e02573b3fc2fe96415322
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10304 bytes
SHA-256: 037d3b37fa2736d37f3251620265300e2d4f2d1bf287cca7d009c90b507f60e4
font_02_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.