Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c5caeb288fc21c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 23:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 337fd2361b0f8371cd92f4ed9795fe21 SHA-1: 78d8465c724ebd1289be124d592944e98354a150 SHA-256: c1c5caeb288fc21cafe373fdf6bf24c98dcb711a3cf334e59dc075a49071cbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://abwingssuffolk2.com/uploads/files/36353311171.pdf In PDF document text
    • http://debeleven.net/UserFiles/File/daludixibobupuw.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5164743526678504dccc738f5db752e8/39417354305.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ed3081beb28b3fb0e1b4280559816d7/nijulirodopututeke.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/52b7e492eb200877488face429c82699/73348577214.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1af4deeb1---6342144079.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607446ee42354---6711920354.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0426952b4---19737881167.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/98169470362.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4f8633d9---sawisi.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/34835005229.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e37878b1---36554682488.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/tafujajinafesobukasixusud.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a7fd83ea---ranagivexowunel.pdfIn PDF document text
    • http://epicridesnepal.com/files/62291245317.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/57f009523dcecc333a0d74bbce9601b4/13052515075.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04bd96444---nivimopetobawekemivovad.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pagun.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/bbcc22e3499e1691091f351eacf85a9b/witap.pdfIn PDF document text
    • https://ekransamara.ru/files/gatupetuzefomisinesu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac724e78cdb---64540501450.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/80893847836.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5dc358a18---fanamafifivegij.pdfIn PDF document text
    • https://equinox-e.com/upload/files/gajiwakit.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/28972339975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=total+quality+management+in+education+journal+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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 11248 bytes
SHA-256: d6b0a8d757815ce1176aacd03242643282f86e0f238c8e839d9c771101084859
font_01_sfnt_off0000f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 15824 bytes
SHA-256: 0f1e6339ce865e42a0b1ae66068532d5a61ccbba5af9929b1861645d1677f014
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1