Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e45c6c18abd752…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e872b77a4a821d5a5170b918a51ebf0 SHA-1: 1aad57e5d2cca7e0c9d81ddb79d3eaf621c13363 SHA-256: a3e45c6c18abd752b63b61368a16651606c0cfbdf4b95ef8a1c6d697866a9ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://massvt.sk/editor_uploads/system/files/satamaloto.pdf In PDF document text
    • http://lukasikgroup.pl/Image/files/sukixovukasu.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/96366969653.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/mesikilukov.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/lusemunefopowaxa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/podotufosiwifiwezus.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/11679067145.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/46883505141.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/68371112735.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/74616755496.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/afe72dfdbac18193d1c0cdfd5cdeaee9/91424723862.pdfIn PDF document text
    • http://anninh247.info/upload/files/bikevitetuveturosijafa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cce4a6fa6---fazuwigujugegapobodixodof.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d091d461a---konefaxakiv.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/77439688870.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/lekunegamawavo.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613156D4A1BC9.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/9use5u724iefb1olg7ttqnbt75/76668275405.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mupomugal.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/bevamokotejujudewogemafer.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xediludevor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=enlight+pixaloop+apkPDF 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_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 19356 bytes
SHA-256: 38b9262e51ce77a3c2f34f1f94407b64d3a7eca8b2c26af0bbd08cc5bb2ff36b
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10308 bytes
SHA-256: fd07cbbb0439f3575827c3dfbcf7cbc01114ae4d7d214fcd54130bd765493daa
font_02_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1