Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20c25a0cc471d2e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 01:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: afd9c3cf7c8e038d5be73c941775b49d SHA-1: 87da9af8b43c60b2345219881541298de9b7b913 SHA-256: d20c25a0cc471d2ef83a781187327fe324be2514d19e140ca1316a1d93d249e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sgcaregiver.org/contents/files/69003115355.pdf In PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/68885511528.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/fupoguzevuwufusutuxinod.pdfIn PDF document text
    • http://chemicalengineers.ie/images/33892943143.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogotonepasox.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/zezogosefazepid.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/zararewededazif.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/jexasuvapivak.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/96665611164.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/1764522486.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/27530479810.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/92501559810.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a8870a9---fopiredolurezu.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/36880811653.pdfIn PDF document text
    • http://agrion.org/upload/fichier/16204753723.pdfIn PDF document text
    • https://5uempat.com/contents/files/sivujekulipamapa.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/zegikusitijudukirogexo.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/vawipilatinunu.pdfIn PDF document text
    • http://vodova51-53.cz/files/zepaxojuzisexijowepuropa.pdfIn PDF document text
    • http://househouse.it/userfiles/files/vimaveluwosilitemonowodim.pdfIn PDF document text
    • http://podarox.ru/public/files/wafutepusaweka.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/14056540656.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/80364519613.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c786e7fe95b3f855daaead580a24dcda/34587518338.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132fdc2d0071---dalezoxoborinot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=top+best+mmorpg+androidPDF 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_off0000f3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 17208 bytes
SHA-256: 431e7512dd25b6c74bb667138d4d45f02944c546eea1fc8dc9ec38c3b2dad3d9
font_01_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 10792 bytes
SHA-256: a948678711a993bb840c4bc3158a997e51a79ca32c309a1614532c44cbc604a9
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1