Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea802d95d0ea5a57…

MALICIOUS

PDF

91.6 KB Created: 2021-07-13 23:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2bbc214c06ed9dfc9e2382b570b63916 SHA-1: 2c28da3708a502e2486ce3266fc8304461b8ff7b SHA-256: ea802d95d0ea5a57868081351377c9ddee04b879a74541b1b905e94996c16c19
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 0.9948

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://ckmandarin.com/uploads/sufamebav.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ff29da66416c2d406f949dcbb8df9afa/gekasiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420b153d1d---vaziloteropusimi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e1161625d---40622114057.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/sevilipakinebata.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b928a6e0b7---3071631321.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/dofolu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/nl4bb7c3qoksdb3li7g9ddde57/49805025885.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/80927744191.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/gegetuwonupixigox.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/db23a0066022d49364e2956bd2731fe7/bixuvoluwakekolu.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e329a9db9b3---16912261837.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/56802458468.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/1896168143.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/84119148866.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/5513422742.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/cda9udlou8h34rbp47cgv8b9m1/23472077038.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pusikiwiwi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/91e915f5f73e28e9275667b50e0f4d8c/84252829018.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f6475737---99277761833.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/961cd2f513afcebc5e4185816ae6afa3/wevanejiserabewemu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a408327d871d336fd61aa7ef80d54e6/vawibumajagezej.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/4582935429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=enter+to+win+ps5PDF 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_off0001015d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 10240 bytes
SHA-256: 416bc40f680c12e6d0e58d5d3ac4352cc386175057b79573a15e32e7c99d7157
font_01_sfnt_off00011898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 17960 bytes
SHA-256: aa4bc386761567e5d4dee3bc2ce31e504bae56831b52e1299fa855afeea9c521