Malicious PDF — malware analysis report

Static analysis result for SHA-256 e234680a00247834…

MALICIOUS

PDF

137.2 KB Created: 2021-07-03 10:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ca34735aa0a24f98fd1fe82776f41510 SHA-1: 7a13ed122677aa0b8a64170278104e0cee8cef16 SHA-256: e234680a002478344413fec7d3bd000b2734df27f7a8df41dadd0f78eea1ab29
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be redirecting users to external content, potentially for SEO manipulation or to host further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9610

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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9aa0fa3a29fe03fdb171dfe9409bac6d/24033993817.pdf In PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/xikupabobebidadokumiwax.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48c5832e53f17f4716b8f0eca1d8de2d/pusivifuvogijawiviz.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/tusupalidu.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69b5a75d0---fowopoxunemibifef.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae109a5b3bd---malonaxakobetojajar.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/gukoson.pdfIn PDF document text
    • http://yuha.be/_files/file/97638734482.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/kitibiginubomulisudejaja.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8f890c29---11200695661.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/27747864718.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/d7366efabe0ccfd77c43614223e02eea/97999787763.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/5735633904.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kisezuxerusozazugefo.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9a2b0df00c061d46b98a01445e710f30/sokavetabob.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66ab0a68a---rekonogipagimakarip.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/77456251677.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c5968ec02008a2f48707b8834bcd1fb/78387464540.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/44649298213.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/17631770885.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/92435979254.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4834ba15c3---28710837776.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/duxil.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/51770413771.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/86285978250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fate+grand+order+first+order+watchPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000190c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190C6 18816 bytes
SHA-256: 6bd495c768f7c861a5dd2be28b4f845dee4218cbe35e31ddd649a46a3f677de9
font_01_sfnt_off0001c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C26B 2672 bytes
SHA-256: 94cc9d200f995a44aef89865a1110c5e7a5898d83975a73e6473104110de263d
font_02_sfnt_off0001cdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDDE 10772 bytes
SHA-256: 0fe50a4ee6c5d9468ef4eb05fd4b02e3b892458f28300bc3d64565689d3eb6a7
font_03_sfnt_off0001e678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E678 16132 bytes
SHA-256: eb83fb48a2f60ac59fad768156047f025764cad4052c8f34695a9c8dd2456ad8
font_04_sfnt_off0001fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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