Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d7db7cab9784d0…

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 12:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c9cbd42bff63e7a4a1f80fa8b1209c35 SHA-1: 054677cb694f372fce204ff159f6b818ccfe845a SHA-256: 65d7db7cab9784d003f1ee7bd6448821fcccc341842e55935d5ec20aa0fa3db7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ML classifier strongly indicates malicious intent. The presence of numerous external URIs and the use of compromised CMS upload storage suggest a tactic to distribute further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=coleman+event+shelter+instructions+pdf PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c430d8740---suzomikisemagovasabir.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/dozug.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5887c94c1---kasazikekaxekuzinenipejas.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25da240b6a---tepunug.pdfIn PDF document text
    • https://mszukam.pl/dat//file/xujimagegavonorixalawof.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/80211814046.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/mofomidejafusu.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/77590739779.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e2f065f---39453600792.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1624583601.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d0f07be9cfb084643db4c276d1f449c4/91238602638.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/901c0869199b569c674fcaf84e044053/83796826317.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/67147618282.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b1d68f82---fubodofuvoxofa.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/40346984360.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/67924973228.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c850cbf70465742691a37b6736cfecfd/31199452725.pdfIn PDF document text
    • http://webursitet.org/Files/file/5579120979.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161174fce4c5d3---pefojavolideruzuxa.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/nisidazarowusotawubofax.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/wowuva.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5d3d14001---lefivonanati.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051512454773499.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/81411989112.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/k1vo4b18tachrj44e4n2bn4rrg/wofuviseteroj.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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 11084 bytes
SHA-256: 63c3e7723ba8dbffd57abde7b8c494b43d8f484a8f1cf4965a1fa7a1ad57731f
font_02_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 18892 bytes
SHA-256: 61e5a7844c97472d7b6880dea8174988c0cc1a11a8a0db20987804933dddd0c0