Malicious PDF — malware analysis report

Static analysis result for SHA-256 9649f6eb8204e04e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 03:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fcbc06ced415a597f88c158a38f082a2 SHA-1: ebf973912d6d0f77be20361046e7ffdd6b1d9b10 SHA-256: 9649f6eb8204e04e5e659b6470200e1babd875b57372c6e5ed4bf1039e98b771
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or appear to be disposable. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://newbiesites.com/userfiles/file/48414767091.pdf In PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/1e7fc26502ca493e1cbfdd3b90d73776/1682731555.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210915file///rafirikenasexe.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/11354040513.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a5b6430f68f0443d6eb9c17aef5fc853/butubanininejafinoke.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/69874161499.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/70931916097.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/mitexubofa.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/rezuwabozajoz.pdfIn PDF document text
    • http://speckrepej.com/upload/file/mugetixutowave.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a309365df2ffc02f0dd8e963823688e9/tisezufisofirow.pdfIn PDF document text
    • http://esen.life/userfiles/file/82938296569.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/65009483781.pdfIn PDF document text
    • https://mattress-leader.com/media/94701797390.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/bedumebuniwijaruge.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/livateritijobamedava.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/7663392108.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d107bd731---77516160823.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b87942e5.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/jifasotewinufonuna.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/3311150154.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/65250456082.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/bexobugodi.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/27731719199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=apk+mod+applicationPDF 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_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 19028 bytes
SHA-256: 706bd35c02114eacb38797474120273298dd35573940c6bd440efb60bae524fd
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 10348 bytes
SHA-256: a2a216614e07a7b23f84586c1ee285177a7ad5ff7db3e828d9d42dcfee683f17