Malicious PDF — malware analysis report

Static analysis result for SHA-256 7115fba4ad7c6ee0…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 10:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5a6ffb8b18fe651c8fad0e062841833e SHA-1: e8c2d8c674663e1ddd2106efd2c9ad41f05bca53 SHA-256: 7115fba4ad7c6ee0b0d833a5eb895c945c2aa6714c5cc83789c76de8780549d7
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 WordPress sites and disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on compromised CMS uploads and disposable hosting. No scripts were extracted, but the sheer volume of suspicious URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=who+is+your+godly+parent+test PDF link annotation
    • http://mikomisushiwc.com/uploads/files/pekuvedawitonosu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vch6q4hr9sq9u4qv98uv7jnkff/1852419823.pdfIn PDF document text
    • https://activepymes.com/pub/file/13843085420.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/tatiripuxax.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c240669b81519362bc716257ffdeb2b9/83626669500.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa71bcc4e8---89755538000.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/kuxagexowedalimipunuzotod.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/1to6c6u0dk4luq78ovrchrtd44/35416124732.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/90ofj1uq2ms6id89sr03eu10t4/nobasogizosisew.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a176594d4c2---24127570574.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d207603afe4---45589136461.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59ba64a4d---63560837453.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bfccefc50f093e30efd4dacdd44ff354/dajadunefujaki.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc948144f4---67169899059.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404f933c4a---fidamaxomepevan.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078680ed89dc---lovimuluxajitila.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/malukunofewasetepubaxo.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/23203904397.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/dezasizukusubifumonon.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/64f06c0600cdeae2df69484283770f9d/89336359372.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a723e853455---dotebixupo.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/8399312508.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b463ea165---rixazoxibapoji.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7ea7a76b6ec4d56889c7bca3de6d2505/tusovapanaxuguzikekuje.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/80099914448.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/50780337974.pdfIn PDF document text
    • 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_off0000f424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16352 bytes
SHA-256: 6463283f3214ef71dd89369ad274733224515ac3f184b08f95fd267a921e0bae
font_01_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 10880 bytes
SHA-256: c148add8679bf9cc6ee0d403a2596649f95d8a406fd817e88081b129382a25f4
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1