Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bda7cb597535305…

MALICIOUS

PDF

71.1 KB Created: 2021-09-15 15:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cde16b31dc16930bfd69663d99f799f SHA-1: d2e88095c48f1cc1d2c2a047920a86a7fb8e97f0 SHA-256: 9bda7cb5975353050c5b24317f282c8eb0c8dc652793ac6ce5b3c6d0dd05b5a8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://leo.tw/upload/ckeditor/files/13554307202.pdf In PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/6389113730.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307598c3c95---jiwarero.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vfp8dqstaksf4a54lfsogbhttk/17588949944.pdfIn PDF document text
    • https://masihpt1.com/contents/files/38907509703.pdfIn PDF document text
    • https://bem-sa.com/img/file/19229796916.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/moxulile.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/miravisofusobinibewawur.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/86007223198.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/33067898304.pdfIn PDF document text
    • http://maulich.vn/attachment/files/fadaxejodajuvafovezekoz.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/zarexi.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/15656967584.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce2859710b---75858163134.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e67a847e5cb3636ab8738111dde931e1/gaxuxewelusodunuxobur.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/nurorapuvanasew.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bc7cf0099025f701df8a7c3b4311c374/vuxopubetof.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb118fe42---ladereso.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jitefiwogaperedevuli.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xixutijasitojeko.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/diladarudakon.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f55c2792e20c8fef15ce88a448f072f7/fiwujifixopifeg.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/70478127118.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/golutaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=root+android+supersuPDF 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_off0000b6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C3 15768 bytes
SHA-256: 2004621e03a28cad9e6b7506e397d823b4313ea5fcf0e33a0b01a36867881306
font_01_sfnt_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 10484 bytes
SHA-256: efb3e93391d3b6e808c7dff5be5cbe10b14cfca2433bd2757c0a2b99c72ac688
font_02_sfnt_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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