Malicious PDF — malware analysis report

Static analysis result for SHA-256 072b24b1955d0f9d…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 02:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27759ddc3332e1f7025c054ec8fd9d33 SHA-1: affd3fe16cb040b0ef705ee74ea52ecde4c02c37 SHA-256: 072b24b1955d0f9d9354584bc699fbee718d5ebc5a8d5ceac98e15af5ef19e1e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many hosted on compromised CMS uploads, suggests a link farm designed to obscure the ultimate destination and potentially distribute phishing content or malware. The PDF structure and link farm characteristics align with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6272

Heuristics 6

  • 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
  • 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://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/4ee34c93a27db7fd567c8e5c86e14aaf/84775793589.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec6731eafcb68dc8444d6994499e09ab/1236181981.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/wozivip.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/77575461533.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/besatozuguxikal.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/dojev.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708212d9584---61421068988.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886557a9739---68198221003.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/xiwutivuwitututumokumal.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e11b51f104fca7d66bb3865238da3a09/92843898123.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/vuwewepagiv.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/befefakokepafogo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/63khai8vn2k7rmoorpuqkqsoft/wopapisazasej.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/dovuwibame.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d59fbec34---todudu.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/mekuwefineden.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160921134bcb84---91666991500.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160948f440f052---tuxafigafujafebozafusuz.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba64a1006d0---wutenezonozavozosapovon.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6c8dc8b7---bobokawuzadudixifuda.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d66db082c5d4dd4584fa93558528db30/70184986956.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/23713150247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+i+see+who+unfollowed+me+on+instagramPDF link annotation
    • 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_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 17884 bytes
SHA-256: 10dccb3cdd4b6046cb2604b60ca8c49d6bd1a5eacf3c648681b67fc6aba6d321
font_01_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 17592 bytes
SHA-256: 4923c092317463a9ab8cb2311725d299c5410763a934feaf0feb59db7eba9b0c

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