Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d0ba2b044e0e85…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39498f2b943769e9e615442bb862289f SHA-1: 5651889be474ccced5d7a2eb616a9950a24132b5 SHA-256: a0d0ba2b044e0e8546605563bcfa329e97753e5dd75d903d3534cf8d8efb809c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lead users to malicious content, potentially for phishing or malware distribution.

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://consoles-a-gagner.com/fckeditor/userfiles/file/wuniwoxeta.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609b167549060---fizabikefananuxikuwabap.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s511rde6tpckdvqjd6hkn81b52/2979366946.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/wegoxudejosubadilinasigu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608270cb4575b---farobexijivasixik.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/riladomisabogeboka.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/xijoxetijelekorunufuduv.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/buxafavofumuras.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/8f98b6e810d14ff4706cb2c99ba148ab/kebisisujubikeredejadiwa.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0871d2dea---96927139387.pdfIn PDF document text
    • http://yulintimber.cn/d/files/megulovovenavalijuzuda.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d22298871e---joridofosekilobexo.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2750ab7ec5da3e6de900e3d3771f5ae2/91264463725.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/65229630593.pdfIn PDF document text
    • http://accronline.com/userfiles/file/2748617911.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/70521210264.pdfIn PDF document text
    • http://specimport.by/files/files/16668197081.pdfIn PDF document text
    • http://aa-nusd.jp/riroxifojepobugo.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/poxebitefevofa.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/veletanugemebitefixijuje.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe1e20554---89605124360.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/bageropobixegojexud.pdfIn PDF document text
    • https://ccskin.com/geektic/files/sasofisiveponilixuk.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f74e535d53c8eae9213b1173b1323f30/bizixipejonedo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27b3fb72---38387399128.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160759e62e4d30---wevenepamip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=redacting+pdf+documents+in+adobePDF 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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAC 18776 bytes
SHA-256: 3f689ffe2138428b6402c073aef5041f2ddbe1e3bf7855232206c327d8cc50b8
font_02_sfnt_off00012eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAF 11104 bytes
SHA-256: ea95491d9fa369dbe120217a8eb0662cba066b3e4e4492daa23d2ac380e0b229

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