Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c40309f8b8ac40…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e7b7fd3b23a91bdf29df89e18240213 SHA-1: e070a22a91555aa47c4e38ffbe7f15349726196b SHA-256: 91c40309f8b8ac40d573b59e6b15e652ffba4bfa54c160b669cb2d37dc4b05c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple links pointing to external resources, including compromised WordPress uploads and disposable hosting, indicates a link farm designed to obscure the ultimate destination and potentially distribute further payloads. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://zensushialiso.com/uploads/files/54064818139.pdf In PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/63132749240.pdfIn PDF document text
    • http://rrarental.org/upload/file/gazagopelegorilekosora.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/jomepidedibofofejofiwom.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/11796259721.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/fofusojekasurodifavijig.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eea58d889---gamuw.pdfIn PDF document text
    • http://apvn.info/userfiles/file/14962473112.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880bc756a2---xoxetapizot.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/3746608605.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/jivivukegojarumufali.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/jonavizu.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/13291708548.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139d146a6ca8---34636799090.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/21451597052.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/13579534653.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/gesaxa.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/30346066354.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/96959007784.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/40276487032.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jaliximuxe.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/fakokabeti.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f980de2474ee788d6f241d11cbb44f02/datuguzifunurijozikopa.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24671924068.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zudowugekenonopisituze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=j5+prime+stock+romPDF 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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE925 10440 bytes
SHA-256: cb7a9503ee4f8c3c9dc2d134f076ec49d73f8f453d56c983440c20d2073276d1
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 16768 bytes
SHA-256: cfd04c245182762c66b26f9b8e3aefa5cf8ff7d11909fe6c20bc6c4a5138ea9e

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