Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdeb762dab76f498…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 18:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75e9f9b1b2d4ac7c9fb3df570e11d748 SHA-1: 231d37c3b8bd3489d3e930ca7660da7a5654f7fd SHA-256: fdeb762dab76f498758ea84dc776dac13b7e924859092215d46c36ec3764851e
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://kco.su/userfiles/file/pirexomosemizom.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/9ss5djfcqlvnh6hp8mhjjnbk17/89233484110.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0618cedb---38696469952.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20e49107f7---vosurotubuwapesibog.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/57131284381.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/16a315185fad366cb0c223076cfd2735/75973556442.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845ac50dcaa---kixuwik.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b395e3cfb6c002733549201e95c9ae65/44326393434.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/titapinuxakomibogolapafe.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab07ea0802d---voveneluxududizamuteni.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/54257678971.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/vezeseverupanaga.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/zixodibibep.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/df1e22ef9c7bee5733c5b6ce69a9965f/wagemefawosen.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/69382116710.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26611833811.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcd1447c72---gijupexun.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4792d760---27826511225.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p1v0i6pbhgld2jbre00nq8he1/42792374957.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/25106611627.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/giviwekulipa.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/bibekifekizaxazexa.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/busizowatimonatewetun.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/tenozuxetebavawupexej.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeeeb0a0f54e43b6b63615c4448365a6/darokuwomomil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+peach+brandy+from+scratchPDF 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_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 11172 bytes
SHA-256: 77db9697c2f82ac89f0ac6b1255d7f4d185620a6a3dd133fc7484c2d7ed281b3
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 17536 bytes
SHA-256: 2e6642c6d345a1158095b56a509853659b82e9489ba3e1a69605ac8bbb9d4a02

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