Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9639520bf5a8208…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 17:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1d4152d31fac4417325aa750e53b0979 SHA-1: 92b8eeaad97505636fa0bcda2e20596e22a4b09d SHA-256: b9639520bf5a82088da4f13e0ebbe253a4df3579e480b1180458c928f3f66bf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wu-pao.com/upfiles/editor/files/49908999271.pdf In PDF document text
    • http://daisin1977.com/js/upload/files/mosinoribid.pdfIn PDF document text
    • https://magatek.com/documents/file/85939268142.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/94269830160.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tojopilexojixejigimak.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/85ee0f43c5295bbc6fd09454b760d357/maxatokupesegamiragazexo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320a647a9fa---8931537912.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/67732348155.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/zesus.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/pozogarabeda.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/kuxalu.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142388eca133---18051744662.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/28989315392.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021091307511480.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/momik.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/bixaxerina.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/39982360601.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/34080315542.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/76593681118.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/48581770785.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613151576da23---nenabipebewupix.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649e95ad04---64122319958.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/puvoviw.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/xigegomaverijixubi.pdfIn PDF document text
    • http://pedraferro.com/files/files/bopivarazojigugorulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+pictures+from+instagram+androidPDF 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_off0000e11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 16124 bytes
SHA-256: 29ca13c52427d8b923fc26eb012942a776eed90dbf908df3cc2cdcc8e18271fc
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 11140 bytes
SHA-256: 90fcc661b017d5c3fe3e0e5454cc523aecf421852eac910e67d4b412b8fa9046

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