Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e151a6793d9e49…

MALICIOUS

PDF

82.0 KB Created: 2021-08-22 10:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15bc339d5d38c2c65340f538453c7013 SHA-1: 08b3917537156af033c7dc2b0b18655799ecb6df SHA-256: 90e151a6793d9e49b084de8e8b5d997dc21c81e7f9a79eec7f2d0ae5c7ca0cdf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 https://semangkabiji.com/contents//files/ligefijetarazeroxotesaxex.pdf In PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061404510480554.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/44851741502.pdfIn PDF document text
    • https://tonitomov.com/picture/file/gepef.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/magaletixeto.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/de7fd847137d0ec98b0cfc2f5a22bd34/duweluguxowagesuwuvu.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/n732codfd9njsbisj9ciiopsq0/pixudemipirosoditev.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/6850491287.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/tusatefowesakotuwi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/99188878730.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075491517d29---gusugenejukexivogan.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/pinipurevajewivirodusobeb.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/59298464698.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609424fd89a59---batixewin.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/6485917339.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/lutivutulegujopalabok.pdfIn PDF document text
    • https://amblamy.ee/upload/file/93653791577.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a3eedb557---jajofezuxoruf.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/27893300038.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210628_A88D0CB13C104B75.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83dc7340---gapabadowedafepoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=illinois+constitution+test+quizletPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/bac299f3e45b5c3a796361e70a227c7f/80049440014.pdfIn PDF document text
    • 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_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 17012 bytes
SHA-256: 190f7ce7991210be2f6e92fa65b1918352e736126b0a4917c5a8e4f6e5a10869
font_01_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 10220 bytes
SHA-256: ead77cfc8437d6f9774e4b108dc210ee9db36a448ab27136ff555d74f31410dc

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