Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d44f431efc9bda…

MALICIOUS

PDF

75.8 KB Created: 2021-09-15 15:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4903a79b9fc891cce8f5cde85262623 SHA-1: c44faf1a93c569d65259159d4e4301ec64b63a86 SHA-256: b6d44f431efc9bda4a3ccc1668584d3fcadbf636bf4010a9e5e6f25edb440247
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=lord+of+war+mod+apk PDF link annotation
    • http://www.gamylai.vn/uploads/files/denusugo.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/nogik.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/25438064591.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/42078444307.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/bojuwagavazarajanovoraxi.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wovurore.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef366632f7.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/mifolub.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/26440769850.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/fbf62d1cc78222a264291c7b8e5212a6/xatewipiziwu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/af9f1318b450141df22f939a90f83209/74918648151.pdfIn PDF document text
    • http://kesifveotesi.com/files/20015063422.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109010837582123.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/69104759024.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/lurasolebigafilibupamig.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/91180954598.pdfIn PDF document text
    • http://canadianrockies.info/files/file/botofubizoferon.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/rorivujetizono.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210904131321.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/17933433642.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/bolaxifusepa.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/83345906711.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/vuvutupupofufajo.pdfIn PDF document text
    • 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_off0000bda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 20656 bytes
SHA-256: 38898b83c03636350974ca3b261da171d292993accfd8c7cbdf81593ab0ad116
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 10156 bytes
SHA-256: d44670abb8cf6870cd26d80dd56191a3e8477eb17b2f515bdd680823da40c18c
font_02_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1