Malicious PDF — malware analysis report

Static analysis result for SHA-256 2780490649efaf94…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 00:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e65ededfdc9e9544bca4012e0a2811dc SHA-1: e290c1b5e89bb7b2762d9e2409d65996c43343d5 SHA-256: 2780490649efaf94eb66c45e7ca6b5d0be6d4e1b04c6f3490146ced570ea4ec4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these redirect chains. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • 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://colafranceschi.it/userfiles/files/junuriperudurexig.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e062f0ba85fbb1a683c39b82aca7c747/zegoduworolewolifubekilaw.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zesovasotirazazimulidakop.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/23730898592.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/negabiw.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/73880395974.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/baduwatuzabamasojuf.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/mogudifavun.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/lusovijosixigerofu.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/nevukanaseduso.pdfIn PDF document text
    • http://a-pluset.com/userfiles/nepusiti.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/ruruniverapixi.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/52520911662.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/zuwamurazut.pdfIn PDF document text
    • http://jonme.net/ckupload/files/fesidorijajenuku.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zobabevekedor.pdfIn PDF document text
    • https://maviet.vn/upload/files/98220924548.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/16072187518.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/70740787742.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/66717253692.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7vgt6nbh7j04ocidjdtikluuu5/21450437103.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/95699434004.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-13/20210913203357983386.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b067870310---6320116501.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/50844864257.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lorozitujuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=3+0+3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 17512 bytes
SHA-256: d96d9917eb7277ad13cc76144d541b54bc0f1fc2ec096f09354fb84d2220d83e
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 9276 bytes
SHA-256: 1e697b479ce974594749dc46d83b7eead50e325946d850ed687e000a889d03b6

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