Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace4350d46af18bb…

MALICIOUS

PDF

65.3 KB Created: 2021-05-25 04:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f72a6cb6645c2c1dfa6095e27bcdfd3 SHA-1: 75458fb63abc49b6a26438fbd1aec77b3aa74aa2 SHA-256: ace4350d46af18bb3c06f183da7bef7202ddc6a4524d19ff90ecf308a215d4ee
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, are part of a broader pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://afgventuregroup.com/cfiles/file/34910935989.pdf
    • http://internationalnetworksolutions.net/files/11788945722.pdf
    • http://akicgiyim.com/userfiles/file/menetigutosutalunepe.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/40025ef601967b0727eaf2061038c01b/pezizebodezimozudaki.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a447fcaa482---57994913127.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0470389eb---68904918522.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7d062aa4d782a1693eb92a1ee505376/95034316983.pdf
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/b22d3f5163128828f8e77e664c48b2cd/lejiloxe.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcd7beaa6---sukekukom.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/td3tdgu9eceohup68bja490u96/gidokadaradipemibejidizov.pdf
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/29a3e2ebefef30f96547236050bb4d2a/nimetadaw.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dc00bc46a---88056726620.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/700242c581c199c54b93ca7957c71eea/65882679078.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5rr95vrkqnsrbg5aiqrjfi4u57/12692170311.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=chirp+spread+spectrum+technology
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da71.bin
769daad554505e0db0e23e9bd3e502efd1d0b41afc84aeb8fbef29c8a4c07ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 5496 bytes

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