Malicious PDF — malware analysis report

Static analysis result for SHA-256 473178e36714c66c…

MALICIOUS

PDF

80.1 KB Created: 2021-05-29 17:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00447d9b217e9000a73625f88174fd6f SHA-1: 7a1993fc63368858765c0611b26f42f6c9268fcc SHA-256: 473178e36714c66c7b9f0d093204d63293397aac75b4633b720786efe3d6f59a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076343f99d9a---dageda.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/5208642036.pdf
    • http://charivne.info/images/file/gigeratunalaxidifeti.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094423b00d61---67666213254.pdf
    • http://andrelandberg.com/userfiles/file/wasipejulugazetenanedog.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/shhihd88321n5dsmdciuolt1u7/1717965650.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4jejkj4hurgnflkg42anrvr4b7/xujozuwejo.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gu0m75lh7ltbi8q36bqgiu7sgh/zetogigujevifegudizuni.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69fa3310b---21899988015.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fj3tnj61sj93145qcmjdh7rgg7/rapedajigegonamojonijo.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160854ef2a5177---93112663126.pdf
    • http://musorcentrum.hu/files/article/file/werevi.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b564ec5a---moxolitufanurugagelom.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e32c4563---xamatuxox.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rttn89u6bh610rn5371shso82o/11856405519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=p226+legion+review
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e512.bin
e4855723380f9302b74ec66352a13ffb1251fc18f9f0614b6a1f16a121e457fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 4904 bytes
font_01_sfnt_off0000f5f2.bin
b971f2a16bfc981665540e9c17f2f35b212dc1847661f1d177567ecf49dc9abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 10840 bytes
font_02_sfnt_off00011b4e.bin
975511f45b1e9875129be477efb8a07c9d547749ef73edd686d28463d51c1fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 17020 bytes

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