Malicious PDF — malware analysis report

Static analysis result for SHA-256 b643eadebc6c203a…

MALICIOUS

PDF

68.0 KB Created: 2021-09-25 06:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5825b0955feb8e8893ddec00a6fa7c31 SHA-1: 1808e2de5530bb2658e765c6b4193827803217b9 SHA-256: b643eadebc6c203ae82921f446da2fb8e238f76bf027ad91a78ec626f0879f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm with numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://saptabangunmanunggal.com/indomobils/upload/file/23574734359.pdf In PDF document text
    • http://serdceprirody.ru/userfiles/file/jaxegajuzarunoraxawig.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/zitibamutosutunakegodib.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/50357905327.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/dobenubulawojizizavux.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/diweliroxarijumuve.pdfIn PDF document text
    • http://grafitym.kz/files/file/gepunofukeburazobo.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/zevipusis.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/vitakok.pdfIn PDF document text
    • http://phanvienphianam.com/uploads/userfiles/file/zazimesakufelev.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/50297360104.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/54106616189.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kamofu.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/13274466801.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/wimesepovunavolikixi.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/koliselopumuloze.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb74cb271a63598abe28bc8c4196595/goraronutegapakofak.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2b0fvt5gf3t2tbf2qo7tai00n5/zuwuk.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/51e7b82b58150559d90dcc4313806388/85406332208.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109230610065019.pdfIn PDF document text
    • http://jinyezi.cn/upload/dalapepagadanotebiwilenek.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/narasev.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/95912852223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=redeem+robux+creditPDF 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_off0000af06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF06 14424 bytes
SHA-256: 5911695eab1b909a1f1bb21a1213a797661d497cd81da4da60dc6447eb02db6b
font_01_sfnt_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 10440 bytes
SHA-256: 8db32e1f81fb296b5b21d8153bb2f37dd2f30507a6ce8979d62fb8ff330a257c