Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f9574b35c5aa77…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 05:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0dcfeb7c351e4b3087ba8093b63fd164 SHA-1: 5b297159b4dafa15761d3e4058c15f09c9e690da SHA-256: 10f9574b35c5aa77f85a212970db554c522193e31da010f25841f542d30f3e87
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9952

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://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/489aenuvpemob24fqriuh22pai/dirosenapozo.pdf In PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87225839771.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/baravikebaj.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9c5751b02---konemukij.pdfIn PDF document text
    • http://ministerium.pt/files/39800525702.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/62227078580.pdfIn PDF document text
    • http://atek-ent.com/upload/file/femuk.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac04448faf---24700305646.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dc08e24cdf8---zuvov.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/bexagekumapuridesexixa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d4e31cff2---94588913442.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57e234df6---83581631975.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e985cadfa0---debetowatajugesot.pdfIn PDF document text
    • http://valeneighbors.com/userimages/todegu.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/65321605950.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/fa78abf650ef058fb3915152d9af788c/23312495612.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8908v1k85aekg43bq7drs5uok9/rodapedefof.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/85752435071.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9d61e1b96fadefed45471e0977872aae/55420986313.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/39259690628.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/piwilawimug.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8d549fcec58e4c2753d6ced520d43d87/dilosasuxikeri.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/oig5ijgtjnroqqhur9jb9ih643/kulasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=obstrucci%C3%B3n+intestinal+pdf+2018PDF 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11400 bytes
SHA-256: 73ada0746bacc0cf0e7f21032b88809595380e43ea3a37f764f16de3c1b1e858
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 20180 bytes
SHA-256: f60f5b8fdddedae04de2894b0faed25244e6d30c7d0017a5ea5840f4646cee30
font_02_sfnt_off00013a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1