Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee8cbbfd0493b31…

MALICIOUS

PDF

83.4 KB Created: 2021-08-31 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a71f4c2c3035a6e9d56bce6be8420be7 SHA-1: a5c8bd00d9795bde5d6234f54ea6b3d8717e0fdb SHA-256: dee8cbbfd0493b3152fbcee7802a30e4856bc206818d7e39c29a16355938714a
96 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute or obscure malicious content. No scripts were extracted, but the structure and URL distribution strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pulsarvn.com/media/ftp/file/jemeraf.pdf In PDF document text
    • http://penzion-u-zamku.cz/files/file/zixepudewuvomamaxotoxode.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/pejobipa.pdfIn PDF document text
    • https://abeess.com/userfiles/file/gegitaxotuxudo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/f058c2f243fc5b0f2d0d21c507af24ab/29520926872.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/96363425000.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ngg3gmoqm4t5iadpvru2080ev0/54240298299.pdfIn PDF document text
    • http://czminghe.com/upload/files/87796525402.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161290822c0419---13810324576.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/wijawetinuwoteloz.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ff57a3c952b0da2b6e28145fdd55c202/29319412521.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/38067061884.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e11cf9577b---tutefogagafawufinip.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094015b7ab40---63429931444.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/tuwadutamumi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c0b24637932---wiludedofixoxurilikir.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/25168375953.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/p9p4ig1cueah5e77kc9482h5pu/gebobuvewolawosozezukibu.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/zewajonawufokewuz.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/80564190285.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad254045b91---tadufuwebixinitebubovono.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d65c9c---66688064287.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/43346642508.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f603becfb5b390e58460f25c0e0f2c0d/juvipetuk.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/73327f1de7081c1fd7d76d6196d2ca24/paxinuxijukom.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1a5f79577---74516973446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=unique+girl+names+that+start+with+sPDF 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_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10772 bytes
SHA-256: 1dcdf99dc449bd4dd23c7229cafda8a6f4daf24e4c192a73d521c3247342c658
font_01_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 18468 bytes
SHA-256: 22e2415d9e159a7c41ac1115066612ab0ebbeafbec92795033ae1dbcaebfc992
font_02_sfnt_off000127be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.