Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe581692f458f49b…

MALICIOUS

PDF

129.8 KB Created: 2021-09-02 13:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a8e80a40cacaa899ad17d69f1e3ff75 SHA-1: 05e9ca6174e27014c2a51799e111785e55e5cf41 SHA-256: fe581692f458f49b82d81055a7efb6c99eab1b56a491aef936d3a4aa379d50dd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to host or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/132e7f26b1f6ae8f9cb463e92838e61f/83473131230.pdf In PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/2297616452.pdfIn PDF document text
    • https://tekartltd.com/upload/files/87836629517.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/77663714682.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210826102531.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608145825e21c---wukujesuzavunulede.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/vegatokalixuruxebu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9feda43d1dbe6e0f84042ec40e7a9c9a/jenadu.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/mibubunowimirenoferona.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/reveroxovovaromog.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/78286182015.pdfIn PDF document text
    • http://fotossc.pl/_files/file/85078732120.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/gilinavilatijubudomebudiv.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/goxasofenuw.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/zewesunirolimokojet.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39dd33a28---seveguvewuvugivud.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfab805e44---jibigorezikumogutimulumav.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/tekelufej.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/24090488310.pdfIn PDF document text
    • http://hainfelderteich.at/60842501991.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ft23e7qi8h6e5cn526hemg1ht4/wegigitosidojukerogipotoj.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f4d1222c01584aa020ce592c4a177fba/lusuberobiz.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/68338868919.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bafa7156b56fbcb089e200318ac13218/84079382689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=summer+internship+report+sample+pdfPDF 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_off000191ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA00 20956 bytes
SHA-256: 8bf21ccfa95e33ec10ead1538ced8dcdbb20c36817970bf41c91cbf00f8a3600
font_02_sfnt_off0001df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF96 10940 bytes
SHA-256: 2238cd20c7a692b47fe6a5c382094872461a5b5e5dc58190c4743d0cf3524079