Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0a30560c7f1447…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 02:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1fa3085550eb9aa284bca4dc74079305 SHA-1: 50b64da5de10edba38e0b8aac8355732f063a726 SHA-256: cd0a30560c7f14474aa3b586c3547af1aa3bf63f60e723b18f6829e00d7ea6a4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, potentially leading to further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://ketchas.ru/uplcv?utm_term=how+to+network+unlock+my+phone PDF link annotation
    • http://architettotamborra.eu/userfiles/files/rupesiner.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/66937481592.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0904a3abcd1ab32b628c5bb146f82071/91841703037.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/70195583876.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7eafcb890---89667350348.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/davifasu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/6261697484.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/diwijodazenakesosalafe.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/47060818243.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161363d0e55238---11082436207.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/wamamozud.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6fe570a6---41004399825.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/15370285179.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/27237374292.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/89236913729.pdfIn PDF document text
    • http://djpress.pl/Image/files/55153341499.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/36778700036.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/vujifejekas.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/lezepuzigobuji.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/3506589424.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bipixituvanidet.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/patikojakogofatomexaj.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/memenomisasazijase.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/70741073127.pdfIn PDF document text
    • https://congchung7.com/upload/file/nimopafofe.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210904_326572421D340E1E.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/54826979899.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 18072 bytes
SHA-256: 3214097689d4ac45b6005db43b68715fb6f9e2b812ad0702a3b22d69e6366072
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 10600 bytes
SHA-256: 76a666e7347b6a1af7f088b0807704bc123a2c49fadd8440c883c07244616ae3
font_02_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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