Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0379f00977ef8e9…

MALICIOUS

PDF

114.3 KB Created: 2021-09-02 13:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 498e5ca7d809cf7ed61e5fea79a82776 SHA-1: 04618d2f06f9df2e97529c003f87ba846d9530fe SHA-256: b0379f00977ef8e962bd80dd5205c3fb448f9ccc2e078e5dc15c5ed553dfdf10
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://haniltm.kr/upfiles/editor/files/74815687115.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c62e303e477a1de3e1e3dd8302778275/zazexikumus.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/e5e8098295d51b042cf5262effee874e/92562541093.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/19664259049.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/22344969456.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/61352170435.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ac6198b2c6cec05d902f92039536da06/jamulotugefajagedejulo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tal30skivf5g5mjc60s0dj95v6/kobolakuzametosag.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/naxonafexojiripanirateton.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/moxijusugoladal.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/donavebutefijom.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ad378c1389c---91609735089.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6645edcb5---33053274753.pdfIn PDF document text
    • https://oferta.lt/i/File/15268677772.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2481886d2---rijigipizo.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210818010508.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/af44de8708bf7d9fa3ea69cfca24b371/9750104841.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/kekowo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/pejezazowerivelumowimale.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/punukapoval.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/47524908630.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/1559945265.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pedexifazepupuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=verbs+of+incomplete+predication+worksheetsPDF 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_off00014ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 11172 bytes
SHA-256: f4a0bd61a436f293b6b4b99064ce68490d16607a9b7c924d61f63f9ba481864a
font_01_sfnt_off000168b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B8 22004 bytes
SHA-256: 2175121627c528f231b02a01ba1310168da145f9b1ba0f3ffacc483a7358fb47
font_02_sfnt_off0001a270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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