Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a3eb8bdddb8990…

MALICIOUS

PDF

87.9 KB Created: 2021-07-14 02:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c95aca235a5eaad353d07b525afb256 SHA-1: 4aa140786ea2263a439b71e9bf54d2781e83579e SHA-256: 24a3eb8bdddb8990d1ccb84f990c0576976ef6c82ceb016c04f4c67fbf40dc5d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely used to distribute further malicious content or for SEO spam. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to obscure the true destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9314af3d3---10079800591.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e235e445432b640927f3d5fd3bb28dfb/46207863505.pdf
    • http://accessiblevehicleservices.com/userfiles/file/kixadaburavexujamezupepo.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b3f3ecc0441a2945fe5f439da33a6442/votesemalunusojoxod.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751c0c0e39---95667917122.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16083766944e14---74122358861.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bc549ad2e78---jebodo.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/eddd9c3637ec733938ee1ac4a42f2fd7/bilokobasokiwelevuribiba.pdf
    • http://norilskgu.ru/userfiles/file/24393984749.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160717d294e61a---jiriwifalujewajofezuke.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3fa6f9e99dacb546be454deeadda1638/zonatokavowunidupesut.pdf
    • http://nitexprofi.cz/userfiles/file/setofezanizali.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b44a50773---8939474294.pdf
    • http://learnersdigest.org/userfiles/file/64618527722.pdf
    • https://aihr-iadh.org/uploads/FCK_files/file/23390452455.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b04caf74a---fibasafazanufaxisovuxi.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6vtnfbka5s6jk0m0mo0cr7285r/10874744650.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a615981b---texasinasutitaxedibifub.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/tibekoso.pdf
    • http://ithalattagarantibelgesi.com/resimlerfiles/38769926606.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a733207b---towuparu.pdf
    • https://ikuseikyokai.jp/ckmedia//files/vujifedevimedikanuzuroge.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d947baa8e95---fudukab.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853dc722d9---kozap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=operating+system+definition+and+types+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24f.bin
a9ba9bdae53b95c873194321e238ebfeff1b997c42c9deb31c64bb30c1257894
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10932 bytes
font_01_sfnt_off00010b78.bin
9c347f430b69282a2e5acca9e72429ef1919d3fec8c7b297675df80609825bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 17664 bytes
font_02_sfnt_off00013a2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2E 16792 bytes