Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40adcc712d322a4…

MALICIOUS

PDF

92.9 KB Created: 2021-08-26 13:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17b276d0d41489490cb9a4524f01cc2f SHA-1: 8ff8e606b9b95def4f89f272894d2b77dff30ba2 SHA-256: e40adcc712d322a4d469c27cab22bc2405b3514d3d4f8a87c593068d107e6770
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://irina-beha.com/ckfinder/userfiles/files/nefupejuxofaf.pdf In PDF document text
    • http://anabakorea.jp/userfiles/file/91046755004.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/10991706910.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/20741740316.pdfIn PDF document text
    • https://advik.net/userfiles/file/90583577334.pdfIn PDF document text
    • http://canoeing.by/pics/files/powofusofime.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f42781197347af5ee1ccad97b02858a3/7866355258.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/kakinirajutubibon.pdfIn PDF document text
    • https://khanikango.in/file/73565590311.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eda8b0d7e---zepokadirujenojolomeruna.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/52450637913.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/vubexikavitawavewarolag.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b1453d415d3aa361fdec2bd2ecbad416/zifotumebed.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/bawozemu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4tiam8boil5dqq8ep8kgm9qj1o/36987029157.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/vovewidatebubaloraduru.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/47924543362.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/87794406598.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a6554c40bf7b48d4c18a29d73b059cb7/vufog.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/37810110519.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0io8i1is1c7m9h4qvg627nqlgi/fozumikeji.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/tobutakiloxagawonemufu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896a4feed29---golevaxewuw.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/97132804012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=bicuspid+meaning+in+tamilPDF 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_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 20060 bytes
SHA-256: 30e26d0fb3be01e11abe73498c5d2c81438857b7742dcf88f05a37c74de859da
font_01_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 10792 bytes
SHA-256: 936a5187dc0b2a0fb5a646e5feca3f18d75fd1aa555854585fb7ae7c999d5299
font_02_sfnt_off00014daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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