Malicious PDF — malware analysis report

Static analysis result for SHA-256 c707532ab236abfe…

MALICIOUS

PDF

97.8 KB Created: 2021-09-06 15:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a1faa918c6e6d37b63d309df3a81ca2 SHA-1: 19f73382a09505aa11194b23c552bfa4556b3bcb SHA-256: c707532ab236abfeb458d3c843f19e1f7f14844384c53b62c83b9ce4da6b2fc1
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://www.mds-horizons.com/upload/files/xufaxivinorovo.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/v20hpbqokqvtorjjulsuotp0vd/dibuwiwo.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/zinipu.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/xiluzadanozuxefatamudul.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vj7qnqns5e0posqaeo93f36gd8/delivurawatubovel.pdfIn PDF document text
    • http://www.bash.cl/media/file/meruragazudoze.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/wadab.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ofrtkre3dogpmode5fj5pl0ktg/78652888725.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/9009094093.pdfIn PDF document text
    • http://prestopc.it/upload/file/95290463253.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e3e7d6a0---78186181552.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160830d9445137---xoregivifakopiku.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/wurimedibizumapowewaz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39ef10cf3---nukunoraseburafuwin.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7d0ntv4aqh1is5icmjubmph0hn/kisevogenawawu.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/8731420760.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/74f3b076c141de8bd50a6a0436b6c8dd/jarokoturelu.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/mebapipiwa.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/tosexowewexano.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/devezevadana.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1b73b8af5cd78e5f82b65088e83187a6/27229554345.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jthif5uu89vg607pk033jjv1mf/43444996522.pdfIn PDF document text
    • https://bselink.com/userfiles/file/26966613955.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49dab1184---7207259098.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610aba74aafa6---gipiv.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c257a81ac32---budukepijurukusokazefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+descent+of+man+charles+darwin+pdfPDF 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_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 18204 bytes
SHA-256: a7b629bbe6669881842fbdfc76778c11d9702fa66fb9d35977244dd2a5779aba
font_01_sfnt_off000147c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C7 10932 bytes
SHA-256: f0783b838e73836abec9e8b23fb97c7ac72765248252955b183c5b7cfa56a67e
font_02_sfnt_off000160f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1