Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d090a7773277b68…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 01:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a57b2716270b59057064dfff0ffdd811 SHA-1: 8da42c4d6123929a437b2a2ffc972a98b8b2f4b2 SHA-256: 4d090a7773277b68816a46deb4a8cafa1a46242148a3f75287937f26f3f00acb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. 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 0.9976

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://lalinpress.com/ckfinder/userfiles/files/75310113707.pdf In PDF document text
    • http://ranch.pl/files/file/tazeziwijidajo.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/mosefoz.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210809065406531916tok608.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/aa231eqltpa80qst6rfnh3balg/87713594682.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/70469197154.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68509a8441edff146ba69e02a10b1c06/fapuziwusipuwikut.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210722_ADDAD4A5FB20DF3D.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/9627200352.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/1eaad006bcd8887628be37d7288f117b/milomidokanusegenirejip.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/60382641244.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/39c86fabb10aa70da9c7ce94408eb334/99893529010.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611334ab835ab---99842661587.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/ruzilugakejijaku.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/16847959633.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2e67212f3b91f593e6fa82214f04fc2e/kufudipigulifokonakotona.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/womowusodisugatufa.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/piropili.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/38486649445.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/34771242341.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t31v44688452t7ioskbkjliho0/jugod.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a163c222e7b---94802245701.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16121cb549fe55---96809188611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+a+worksheet+read+onlyPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 16436 bytes
SHA-256: b37168752bdba9e60a96ea8d18cb60985c74f117e6cb0dd9b08b4e608d0ddb21
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 10704 bytes
SHA-256: 46bc8c82e36b90b707252593d99b91dd4900de32dd582675a2ae030afe98b849
font_02_sfnt_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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