Malicious PDF — malware analysis report

Static analysis result for SHA-256 412501238a7cd94a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-10 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d38da7cd02f8f0117e3fc31f6278827 SHA-1: cc6b17a0e926cca2ebc87f473d65f30f52ff5560 SHA-256: 412501238a7cd94afab4e4375b5219b2ae4794dbe6d082cc158cdc4b2e27ae84
164 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. The presence of embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting, suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights links hosted on compromised WordPress upload storage, reinforcing the malicious nature of the external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://phongthuyphatloc.com/luutru/files/medikesib.pdf In PDF document text
    • http://plkorea77.com/ckupload/files/74163523234.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/temibetutudesegovu.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/28989315392.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/zisetix.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/sukajasutifavizepisedabom.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/55341793633.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fevigebipelakalimuf.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/73834820278.pdfIn PDF document text
    • http://poliinc.com/upload/files/zawuziguba.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/38743157156.pdfIn PDF document text
    • https://invision.buzyhub.com/files/34008731472.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/25402595856.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwelakakojudovusolaz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a883a5158d---91998374124.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98196650598.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/furakixavuwexarisi.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/biludupawudabekovorojudep.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/69374951199.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/41518256857.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/79936791927.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/buvunigazef.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/xedesafa.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18958706155.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0abc39ce---liribedinulaxeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=adultery+paulo+coelho+pdfPDF 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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 10548 bytes
SHA-256: eaf10be1096ebcf1b52224e7cb3c7a0c5e6ec7d0323ef434b537703de5d3972b
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 18132 bytes
SHA-256: 6bf7a063dd4e9f2c8999297a771009f05cf495dffb7758f5da0f3de5c8eb4ed1

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