Malicious PDF — malware analysis report

Static analysis result for SHA-256 f752054dea618c84…

MALICIOUS

PDF

94.3 KB Created: 2021-08-06 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67e93815031f914bf4f17a7abe02471d SHA-1: b0d8500d012f117259b7c7e9d12b01102c08b986 SHA-256: f752054dea618c84665d6961e69bf5146ba5809b144e1a22302ca74b297d07d9
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this. The document's purpose appears to be directing users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://yukkumpulgroup2.com/contents//files/81802934446.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0905ed3c84---tamabadorofijezubutajol.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/darusunemunifu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/semefusodorimoborajasidi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a56e21dfdb95aabe20302cf0371c72c1/rezesaf.pdfIn PDF document text
    • https://capecoralliving.com/media/file/dixuwujowagukin.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/jimezinawokuza.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/56732147039.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/13rg7khdr1kstvbr77aoqpac6q/bigexiluz.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/d07689a43760cc5d8b86c221e1295434/fofamajifoguvosazesigul.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40b20f632---xasonugurobesexiba.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/gebavadebubato.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bae9c799505---86752585029.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dhqfjgts9u4jnchouiu86a5jd7/92218074924.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1745210658.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wazakesuxuxu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705b1ec834b---lenunojefegexobulo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/bexega.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16098322c3c5b9---gofiwifima.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/75953130241.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089814e65bef---4831683198.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ecbb940---19918529869.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa92b778d---vakika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+lose+fat+meal+planPDF 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_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 17864 bytes
SHA-256: dabed047fe0b54c635cca1cfd5758d2ed6e83c2bce36f315ff0254def42acc0e
font_01_sfnt_off00013930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 10404 bytes
SHA-256: c70b5bf42af6e2616cdcff4c2ce606023f18791422a20b108e0c7cd6d37c51b9

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