Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d753a59315b7733…

MALICIOUS

PDF

86.6 KB Created: 2021-07-06 20:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4d74dd9f5c98429036df2c788f6da0e4 SHA-1: 93a727ec888c193a3ec47d71423419d60934ad5c SHA-256: 4d753a59315b773319fe94b08f022856d06cf523b2c15fc128e9118ea341a3fc
136 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the document may be intended to trick users into downloading a password-protected archive, a common tactic to bypass security filters. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bce726cc---62715735429.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k0sgkn68dkiq3hh4mosgda5le4/75717451131.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/nedona.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ki06ukofsab3c8qqp0slv9tt88/buponuvarit.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f98ee14cd---58884370290.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/42379074698.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/448977d0b834c1e0ac60473b48b8b7d0/16408510833.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hufioh7ohdv0h117d6n53m53a0/vexerenekawoz.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893d547421---71128375760.pdfIn PDF document text
    • http://devison-matras.com/upload/file/4896649521.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/towezidupitinezamodi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a34b4ed9e74330fbc3d002002392fe66/lanizawiwij.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210617_015A0E24F236DAB4.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/41546862341.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/42656610286.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vajegoniza.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/62093145951.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/jagonobilekapudo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/21f2c359c3713232fda2592e9076a0c3/86732023595.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7e1118aed9fd8b66e2e56b1e473e6ce8/tapudakewezusefixole.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62184192565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wwe+2k19+apk+and+obb+downloadPDF 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_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 17944 bytes
SHA-256: 41b4fc4362260ccbca00ff2c0572b3cdb3718c76a0eeb8ba62957caaf194f918
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 10580 bytes
SHA-256: 77ae2e96f279cc14ab3cf7aceb2117f1e3e48cb8cfc5ad16ad19494e2b9ce19a

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