Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d2577258f01319…

MALICIOUS

PDF

78.7 KB Created: 2021-09-18 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4141d77c350026b902d628a800e5b7a6 SHA-1: de8c265357feb6e6e76b9b7a197198fcada32d9a SHA-256: 72d2577258f0131910b90ad18c11a01439b3e8a91a55209032197922c9d0d5b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://legalinet.eu/userfiles/files/81632151370.pdf In PDF document text
    • http://lex.tj/img/file/28975530650.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/13f4cf258d938754b22fa0de19a37776/64676761292.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/nunedik.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/71994552591.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jexolusufutozo.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/kedajepugamorupixojo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/jjsbmrki6pdap1jnrkn1blgc4o/wibog.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/tunuziwuvewofazit.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/zaxoxopadujojajinuxegevib.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/roperozuvuti.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/37457258235.pdfIn PDF document text
    • http://exima.kr/userData/board/file/xowiromiribimotelu.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8ad778672---47966192648.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161370d2ab6fa4---botigakakewojepavozik.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/43239683156.pdfIn PDF document text
    • https://keongracun.org/contents/files/7150620145.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/gosadivaj.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/kojexujexikibarufapupigi.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/35866269122.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/guvaka.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/21106102956.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2835cad7050c78cc2bae9636f0accca6/93974080310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hublaa+liker+apk+download+2020PDF 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_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16916 bytes
SHA-256: b264fd5c28416b93aa876f42b8262cee05a887ce8650eff4cbd42efdabb940c6
font_02_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 10772 bytes
SHA-256: 5a58f83cf2930e255f67d9fe0dd4f7741d90f4c070641009765575d5f0c87ab7

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