Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedefc0cb26a6e44…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 21:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7456760a01479666029bac6489e9902 SHA-1: 9d56d2cbf4d692e31caca30b9ecdf20e255cc773 SHA-256: aedefc0cb26a6e44bad39da5cd9db7416df013d7d2f917db5ac33f717bada849
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm designed to direct users to potentially harmful sites. No scripts were extracted, but the structure suggests a lure document intended to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://locthanhwindow.com/img_duhoc/files/gewudabesokugexasedetanu.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a27cd77ba10a056a84ec4f84ecdb0e1b/ziziwuvesiditolumubob.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/0863bf01c311240ea35e01eb13e6e1d8/wurorivonegusomaroz.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/54550524783.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/70501160312.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9c7f204850c03cc6f72c694535199c/moviviratul.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210901083209386985vmn6ha.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7e32eeb73---tebuxinazixegimu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/17a5d42e5b21721a99a3b28007e60fa3/88506253639.pdfIn PDF document text
    • https://loctra.net/userfiles/file/99243028038.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/larigijiku.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160858b4fe04e7---zoninarejananijuzo.pdfIn PDF document text
    • https://mkart.it/uploads/file/bolunasujegazakif.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f57711e9e---97407736491.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/377c40f2c1944fbae40cd7b13e5adedb/43440634728.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/75340944127.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210605125159.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ec63b70f87460edcbadb2e890c312518/gonujavefovol.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/jirilevafe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9f7eba5---78479147583.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/58554623819.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zaxos.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ad80f11edc540d00f824d8950aaa02ff/degepikokinanomogudinare.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/57281936070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sensory+organs+pdfPDF 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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 10628 bytes
SHA-256: b71729ca5e80baffab5b62f8d4070e7caf725a2a2a98734d177b5806457c78a1
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 17952 bytes
SHA-256: 07e4844387c3753db9e7a7ec17394e6df390899b1ad5ba98168a7383c6c65b8b
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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