Malicious PDF — malware analysis report

Static analysis result for SHA-256 e881e15793436e21…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 00:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc307510f8e2874efbff03aacd595d86 SHA-1: 1bf0d56fe647ec7e9884d5a24340102b50dec9b1 SHA-256: e881e15793436e21d59b690441f407f20fca90a93cd320580030344ab396b615
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sensi-leszno.pl/userfiles/file/livonepufojere.pdf In PDF document text
    • http://szjglaw.com/uploadfile/file/2021090323304573499.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/maparupazizapenawukewag.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/19411787891.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161302f8e87aa0---32147032366.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/38987596604.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kiginosemo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/22502023165.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/43191076449.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/mibabuwenaf.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161332599d69dc---zasabusowebomunijizo.pdfIn PDF document text
    • https://network-italia.it/file/morakipinutigejurutop.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bobet.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/noxigarivuri.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/73452788223.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161396056101bc---doterolanumemorojezolik.pdfIn PDF document text
    • http://winso.tw/userfiles/file/89769210724.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/19340596570.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/36447819258.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/13570125885.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aeff9b862bf181131d1708a90b6babca/19039858918.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/medafojoterikozevesi.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614509c334094---vomobirewozogafovufu.pdfIn PDF document text
    • http://videocycling.info/files/file/77205073771.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161310b24efe72---zegunitemodasadapevut.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/zoteketiriwom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=programa+para+backup+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_off0000d06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06E 17232 bytes
SHA-256: b0db59dbe25df5d184a27813a8d7f9b630f67e076092475ca0bcf113af2955f1
font_01_sfnt_off0000fd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 10748 bytes
SHA-256: 0b2913a33d0e35d6adbfe92a0a9ed60ffa5c1e9cc987ad4dd2232bde1246eec2
font_02_sfnt_off00011574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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