Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19cf2dd5ea2e355…

MALICIOUS

PDF

87.8 KB Created: 2021-09-02 00:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a18c2b8e37ea2cdc23f7d9e1b511a1cb SHA-1: 5404b76688003f40e8e23b0bced4fdc63cf33a4d SHA-256: a19cf2dd5ea2e3554fc2164bc9e767cba772ce9c16a46c3ea0567ffdc0cfc3ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f350774f8f0---vixirakezezitomewot.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2efc69ba1---bowexowige.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/33660473985.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/25269059977.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/lusupavobekupomujobe.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/88957035071.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/46555868197.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/97773125386.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e30919fb5---powawogagukemiwegi.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rekaweza.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/besafajumaxegifukom.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210716131224.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a182b885ed7---bavutu.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/10035909639.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/90336618418.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/tifiwari.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/memagilebifijokazakoxa.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/11062713310.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098438870495---95514532325.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af95e55aa97---52476827307.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1628522671.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/58274671724.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21062023431688515083kn1iz3ai5i.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16123841c8874c---59715713276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lessons+from+the+church+at+thyatiraPDF 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_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 18092 bytes
SHA-256: dd549687987bd6ead68115a03bb40cf7ede555a9dd2eed5027942f098a7769a8
font_01_sfnt_off00011e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 10724 bytes
SHA-256: 91eaff38830c559eac18e3febe44d94cb027158db85aad528fdc6300db7b50a7
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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