Malicious PDF — malware analysis report

Static analysis result for SHA-256 198c5c2a87864ad9…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 13:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffa60c9702c89b93c6eb9a020b2177aa SHA-1: d11ee6fa8ed8b7f76468163ad9ef8181e53cc825 SHA-256: 198c5c2a87864ad9cc8c4d0256a42b6e7413fc46d1497df6bbfc5d4416476d6d
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 CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://machnhaduong.com/images/uploads/files/weredetipenekelo.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267da8b1f1---jazoxowonukiwupodi.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/mifozavimevawesivowefude.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/93547995238.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/84715203394.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/82420660219.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/diwipepomopefadamopafanil.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/zagedenawikusipote.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/33914897137.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zesisonofikesariwiwomu.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/fuzimejupep.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/duxagemoberenubudalif.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/wilusitujupemezovo.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/lojalanunusudutaratukeg.pdfIn PDF document text
    • https://huanghecables.com/d/files/kekixozizimix.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wujopozegog.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/jifimez.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sataferukutedajeba.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/61074230582.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b5d6c167---xibexixitotawodi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/zarevemijokoverekapapeb.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/c0639dcd219a71640888063e2523a66c/fovun.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xukazokimirutanajoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+grand+budapest+hotel+full+movie+downloadPDF 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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 18084 bytes
SHA-256: fbcbdd0acb00742fd93c8e88eeca263282600a4531e04651b8b31288b46026df
font_01_sfnt_off00010e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E61 11300 bytes
SHA-256: abc5b438f5e19701fc4f789a677d8d2de061bffecc20159285e1b9c769b08954
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1