Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1593d8d5c523a4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 19:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 72b7f05c2b322260b55ff7f64df15fab SHA-1: f242a5a4432ec9f79fb7a568c744357145e586ae SHA-256: be1593d8d5c523a46af7c3a5688668a4703ae2541551fe3b7b46166ecbe72b8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDF documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

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://biomax.shop/filespath/files/20210908150019.pdf In PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/63929624022.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/babuf.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sogubetepinikivepija.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/14480456575.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135953847acf---sotobajivamomi.pdfIn PDF document text
    • http://artospace.com/pics/file/81298656518.pdfIn PDF document text
    • http://baove247.org/upload/files/vifatanodoruxeba.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/nokepoderarejovobevadinaw.pdfIn PDF document text
    • http://sakra.sk/storage/file/webul.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/13115829048.pdfIn PDF document text
    • http://state-lithium.com/upload/files/14642423609.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132588213ea5---82773045025.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/77095031992.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/suruf.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8a98f50ae9d005cbfefce42c4742865/revemuk.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/mogowukoturep.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109042318459202.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vizajagorokasafu.pdfIn PDF document text
    • https://t2sc.me/userfiles/kiwojorinejanifipokifuwav.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/suxaruledegukibotapazupip.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/xalomipojomunojufonebuda.pdfIn PDF document text
    • https://hobbypet.cz/files/file/batojedesewedosuxixawab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=type+of+blogPDF 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_off0000db5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5E 10024 bytes
SHA-256: 80b215895e1a135c6ebb5a2814773f997ec58390c87ebc80318ff4eefd12648f
font_01_sfnt_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 18632 bytes
SHA-256: 3cbb3a16c63f3ad68d03381344679a624c99e0e09f5dd037e8e54c7b0a5c2641
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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