Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3afb13f22ecac6…

MALICIOUS

PDF

93.0 KB Created: 2021-07-06 07:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7c300e48b66e3680485202e568812aa6 SHA-1: e6316cfc56abea50cd47f58229dd5abc361a25a9 SHA-256: 8e3afb13f22ecac6bfb2cc908be1d05a38787f10d8187f3f6a9b24dbe4e23be6
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple distinct hosts hosting similar malicious file structures suggests a coordinated effort to distribute malware or engage in SEO poisoning. No scripts were extracted, but the structure itself is indicative of a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/epapu63flh8tdiqoarbe2n0u3h/nefoxizuzep.pdf In PDF document text
    • http://kunbot.com/upload/files/titipuse.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/88333630195.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/69879571355.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a753a4d3adce0f6813ea8d700b051749/getupuzukusugujerawopiwu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b42e69731---49378448570.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608320d2c9682---32883024450.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3b62864f0---pinumojodipudosenotisapaw.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kobivuvivo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/37bd14ea16127c06f726fc371b50d95f/duzexuzabeloz.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/zewunadinavuzefixuwedine.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/160911d4df06435acf422a069a3277b4/34577914677.pdfIn PDF document text
    • https://laser123.com/geektic/files/sisuxunelede.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a100a28a6f6---58166282259.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe8fb93fc---92928652792.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/pefunepijedulizeti.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/45190730045.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e487f0b---luxopuxegokibiw.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4bff41b56cd72ef26943494236025b10/59194782782.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607bee6b45e24---mefemosoz.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d1aae0113055f0bcbfd88e8818c68efd/55024412479.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9f7799b7e7dbe1103208c19b4d057656/tetorajolerotiput.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/38673252780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=http+proxy+injector+v1+0.1+7+passwordPDF 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_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 18388 bytes
SHA-256: 29be09fdd8095fa928b27c1f63f2dc228464364028a0ae3a30566b0ae9fe4448
font_01_sfnt_off00013226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3D 11240 bytes
SHA-256: ec75c06eb82f35ad75f7c91c1e1959fd14f44b6bc8b8cdb698516f8d61d7db1f

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