Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded904bf878b8dc6…

MALICIOUS

PDF

81.1 KB Created: 2021-06-27 18:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 172c37fd45163dce44180701497123d0 SHA-1: b8d04032a1016c29fbb92b1d2b1b3aa7e2f7f9ab SHA-256: ded904bf878b8dc61eb6ddbf26dae9c41e9237cbc22ec5e0bab9b7b9662a9aa7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the nature of the links indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=learn+java+game PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eb178beb---sudovomasekuba.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/ebd85038d7dd81b527b9da4c50c4e449/kaluzukamunibomaw.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/87027081155.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/4151821585.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2db1ddff2---tiveba.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/tikagitutobovato.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/10f13b81e96c6677aae831d714ab3434/forizotup.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/647c409b4b8921ecbed4b16c9d289466/64676071319.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c74468ab0071d0663ff0eac11214b722/bozimegewaxukijap.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07a13473---9661434605.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160779092a8d45---wirutakuja.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9183ae1501---71933830040.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/kemuvugatepevupesi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/peramowatenajenus.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kcbobd1evsqesdqmqspl4f7gi0/mubemoratotawefej.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/mubadesewavibofa.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/kibelupefudeke.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/35771425391.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bb43d13c6---79717568072.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/zinupekebisuda.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/suvoxemifiludotitixodoneb.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7647c8953e---64737596463.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/d5gv6878s3f2fd1kn7sm5jmcef/14924796819.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d63fc13326c986e2a3f8a23e127bcf3e/basepokuwujubixotira.pdfIn PDF document text
    • http://java67.comForIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73578166946.pdfIn PDF document text
    • http://javarevisited.blogspot.comIn 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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16836 bytes
SHA-256: 83ed3441af40dce24c0e9231e6469cb599389448ba82a6e620adece0ab724f9b
font_01_sfnt_off000108d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 10080 bytes
SHA-256: 299a7592980f49be7a118e7db2d790a72dda5ddc352b82d94509878d84c4014c