Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da4ca7c2e69a462…

MALICIOUS

PDF

105.7 KB Created: 2021-06-28 08:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 113e84c18f0cc328de1c26de64cb97e5 SHA-1: 52ec3c3999e7ee58e802c71878da34666b98a82c SHA-256: 9da4ca7c2e69a4629d6c083f304b5e9181234cbab3bf2420b808cf282d830bf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=crows+explode+download PDF link annotation
    • http://fonnepal.org/userfiles/file/gokatuwor.pdfIn PDF document text
    • https://maturana.cl/upload/file/joripikeb.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81fe87df---35658029426.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/velagivirizupi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/17ld3vnsisdnharcognvfa5l0h/3318604203.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/58294901168.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c7722b7d864---zawokibirabemaxunibizuju.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ebd17846---30816895575.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/75721989657.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1d3dbaf6---75458418238.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/udjqqhc41rgro8fb6dahsproo2/34280623705.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/gisafibema.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ldk05ve3v2ss1avhmq92kaiig0/dixikogeji.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608700262fc68---disijab.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce3b9cbce---71528306243.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nidorovuwinuwisojedux.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/25425767740.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/9831861532.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e4f7567f---8924351501.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/451463946fca2439203907f17ee003a5/kogulivoruge.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE5 10416 bytes
SHA-256: ec36aceeb1497eb82f95707784549475481e1708d7337811f3d24d779419d112
font_01_sfnt_off000145af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AF 18156 bytes
SHA-256: c8a914c7be9612d543bc0f5d86f3d83936b62fff87be774f37b6ba5a3b179dec
font_02_sfnt_off000175f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E05 2660 bytes
SHA-256: 58fd5d5f3142228b374551ab81023e54664d002ad087afcb38289dd2dc081900

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