Malicious PDF — malware analysis report

Static analysis result for SHA-256 c737db471abf7fba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c69eca9dd721879dd980f636415c0db2 SHA-1: d07da3bd1472563693830bd033105f8d44f51fb2 SHA-256: c737db471abf7fbaa3fbc905aeeb77875419d954818041cd3f04ffe3a95832ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or SEO manipulation schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=fraction+scientific+notation+calculator PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16146de5f4b4fc---18355946692.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/71663651980.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/93783017503.pdfIn PDF document text
    • http://licausi.it/userfiles/files/20584312982.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/mexowefenebuk.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/pokelowubulunewugelusimin.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/75750605364.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/baniberatavolovajufug.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/xirofadizatajedifobin.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/31996416409.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/mobeluma.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/14961596565.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vofigutezekabitewif.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/20112307523.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/ruzogirugokemokijilo.pdfIn PDF document text
    • https://fultoys.com/userfiles/mazasidavojizeditekik.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/ketozusew.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a140c0539fe4eff02ac9d2d91c3a1f89/46137826205.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/tumagag.pdfIn PDF document text
    • http://mp-journal.com/media/file/1266708388.pdfIn PDF document text
    • http://wwstationery.com/files/file/9582022386.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/97303274029.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///87478859712.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a9a6566982393d268312cc4c51aa4334/90386650130.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/walanekufobazuvot.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614084616c30f---rugolaba.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/53564132402.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 10404 bytes
SHA-256: 6914794d9ca784a622671e10a8b7d47d23e2703ed2f638b86f857384e7b2d6f1
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 18752 bytes
SHA-256: 2d687d3f9247968316745e9510570bf685e7a5283e3997529e553133ed889e26

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