Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac38319115f30b3…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 20:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8e653c2325bd6dca54932e1ab5dc6be SHA-1: b95877758b3b5cc20f43658536e4e6716f47a5d0 SHA-256: 8ac38319115f30b340727de7b4a0e008649427cbfae0f68d17b79de35a5b44b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains an embedded JavaScript stream, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Additionally, numerous URLs were extracted, many pointing to compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hengtaixin.com/HangShun/ckfinder/userfiles/files/ziwisu.pdf In PDF document text
    • http://cn-junsheng.com/upload/file///2021625144390023.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/he05fuvs0e4v791j91gqb065um/durisuvinugatironom.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/jewarokodoxuki.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e9c7b50ee---58136300234.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/a8l82dm2ttif4t9a17acd8d6h4/kepinon.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d61824c096b93a00fff2c132835dff73/xakutikobodekofesegok.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/28801438185.pdfIn PDF document text
    • http://sinoorchids.com/image/file/wufavosukategobawexeka.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3a75c659---95520588496.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/82ae295f24f41b1991c6c804e6d44b6c/vusugo.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/42742975086.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/muwadelirepuvugokutinevo.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/58659752f34a882476100b6532c7d02b/28140563497.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pavejisatubeketosodop.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/xafeg.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/bubiw.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/71716966813.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/fugujoja.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/2289fb10b965b2c684756fe08b021807/9136155819.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/fetopotov.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/43830602945.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/pifakesunoxumujifinex.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/65681031095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=genetics+pdf+class+12PDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 16560 bytes
SHA-256: f9f3e09daa3ac0decde816b0bc0e6661b6af26c39bd1fc07e26b43fc902156a2
font_01_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 10604 bytes
SHA-256: cc3d399c5231cb15c8d6459a0d068748e3538d7fe48e28354a0d911096008db8
font_02_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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