Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe3e44039116b5d…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 03:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f5dfa5f2f5fda9545d62bd482981a6c6 SHA-1: 17d828fcc968aa9415add527f5c8403a85a3d206 SHA-256: afe3e44039116b5d464e6640db96e31d6e2c86813d2d37bb6a0d38f39a9f8ead
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=descargar+ghost+n+goblins+para+android PDF link annotation
    • http://bertrandetgastineaudesigners.fr/userfiles/file/59825011989.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/pigonofeme.pdfIn PDF document text
    • http://osayit.com/images/file/lolevefuduko.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/32685268299.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/64975225226.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/21926366843.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/legomisurosol.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac149a9d---96273939833.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/57526159715.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/36227772640.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6c10e445c---zaweduxuwosibapojul.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/14025529112.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/64876492496.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/guvubulodemonenuku.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/bakajakuzejutavako.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/zobevusigijini.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/59584212200.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5ccedb9092a03231b16eff1a4823fbc0/fuxaxower.pdfIn PDF document text
    • https://stauber.lt/images/files/12737404973.pdfIn PDF document text
    • https://geloracinta.com/contents/files/72341221376.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/xarilufibitagosamewuwup.pdfIn PDF document text
    • http://sergeybazarov.ru/file/fimofedurolaliruzan.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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 10936 bytes
SHA-256: 59e563626bbca73ad2a665a715939b589d20059b06dc1cac623230e0ecb5fad4
font_01_sfnt_off0000c773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 16104 bytes
SHA-256: b706cc7e0995a86d4db735517e26a9b403446e86b8f42d3c6db49866c4bc6c57
font_02_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1