Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d74a3e57cf60c1…

MALICIOUS

PDF

88.8 KB Created: 2021-07-07 12:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 171cdd7414f07be3c1f80c639767d4ac SHA-1: 7dd14a219c45772c43f4183fe50755584b8e0459 SHA-256: 30d74a3e57cf60c19d01fab091d637c99b4d19ee84fbb39661b764422b29aaf1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of hosting or linking to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/62741286934.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/gme2ehts24d6r90f28b48qs4v2/70415072790.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/7276258635.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/164beb90545c69092ec7aa03685de5f8/31018344463.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806ba162b56---jifoperepozij.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/27791211944.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/6b0ce6a3e0384ac67ee883165c3fe07a/68724765638.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/53804627313.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/kadojagulu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd44e24b07023be378ff7abdc18a2566/tonukej.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/160201ab3594b9f98be71788287e1bfd/tuziguguxuwizekixegi.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ld0mpcl2938arrkcdhe7jnn912/79367816940.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b2828a7a4f3---zumemiroriwuvepusuxoduk.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd2e76dde---4655934302.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/83860149439.pdfIn PDF document text
    • http://jaqalsports.com/files/file/4192326963.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7ae8a8e4f4396fc02fa9200a2b5963c6/lutivofu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mggofbatrmt0u6cl4htur3e912/29789988348.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7f80eed7ea8644b690771852486b831b/53034787303.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607348d433e82---72902954839.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e285442100b---2335968332.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/nukataj.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/62005639546.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/riwatizafeg.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9b4ffa808adc0b218effd78df4af2ada/zifigodurenel.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/b3rhv30rteal6r9r470ujhlp8t/99127915829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=posterior+deltoid+exercises+at+homePDF 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_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 16772 bytes
SHA-256: 5c37d3289237838d892a7181d05ec0356285a84b482724d98ccdc7b9a7eebe89
font_01_sfnt_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 10636 bytes
SHA-256: 92c338236f4e94f327752d56d75dea0a3c8479a201a7e49e01cadd4045e8cf2b
font_02_sfnt_off00013bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1