Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b6f52627435f15…

MALICIOUS

PDF

91.3 KB Created: 2021-07-02 00:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 771be7d730972f0d8b3ad076ec299e6c SHA-1: ecb40c76a8b199a26ecc4a7b57ca695db26de53c SHA-256: d8b6f52627435f15c1d8251bee35ae4c59e923d44841a88e69d76c56511cc16a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites, potentially for exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crewmak.ru/uplcv?utm_term=at+what+age+can+you+get+a+license+in+texas
    • https://unosms.us/userfiles/file/23268065917.pdf
    • http://burrburroughsfamily.com/clients/55468/File/jumizozedus.pdf
    • http://xtra360.net/campannas/file/wipizibedeful.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e0b93c25c---56792376451.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33775362d---bodalujatijagewulibopatu.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/93319467589.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/op0b3uk1o42knc4aclij0oigi2/medopuw.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/810c6cc59be1089c59949fc88e0b81ea/ropalijubexu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803fc3b1e6e---87792927204.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6eaa3c79585cf7b06d7b238ebb55aa26/39658478528.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609770da27ac5---77453138668.pdf
    • https://clubsportedinburgh.org/userfiles/files/welunolalewobi.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b89621e2---tozukelaveloto.pdf
    • http://accronline.com/userfiles/file/21327552875.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ac04b30---52501573723.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c7671a4d---derebegarusisovuruj.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a0857390---90029152819.pdf
    • http://budohurtsa.pl/userfiles/file/xulimetanewafixitaropu.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9vgko28oflp9pads6284pkkkd4/84251673225.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/10fb31b9e8d446c74c85ba32e192bd7e/zefekeku.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9dfe78bc0b85035e7f24cb76d9aa0ab2/pugovabudeme.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001a50ff20---48937741051.pdf
    • http://yonseri.org/userfiles/files/82738949441.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c64bf048e---53536342451.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fbbebba5---90861824888.pdf
    • 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://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_off0000ff6e.bin
8a98505999d7dc9035f8536a2c9c78994c8bae06fd0f0ad40a5ad3107fbd50a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 17456 bytes
font_01_sfnt_off00012d16.bin
89758d406b8064058287875a5f28043d63b0661e53c3c3dcc08e99ed1e4dd2fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 10792 bytes
font_02_sfnt_off00014606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14606 16792 bytes

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