Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66de2f0c608dcc0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88ec19ebd4395c76305a97f357a924e6 SHA-1: ab3e83c27ff52f173d9433cfcf97131e59727a0a SHA-256: e66de2f0c608dcc0e1b2a3294d5eb9f4c0359e674272a39a89649d54bc242d5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the document contains a large number of links pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lawtutors.co.uk/js/ckfinder/userfiles/files/pujosibukodulibot.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/dilasisev.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210625101625.pdfIn PDF document text
    • https://loctra.net/userfiles/file/12649523196.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/24828249834.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/18162688320.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060d78fd30---lenufituzoji.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070e21254bae---39083790696.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/20c08474108ef9117833b774ca50a0bb/71561151336.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/7961af071df58dd265bca78e93c74d6b/kowitadogaxudukokeluf.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/14912575031.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608777c0a5d2c---wijujezatisala.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1610546d2f2451---94650177823.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c704beba44f---50809384157.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/najejerepalovamenufojo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c796359db6d---40365971895.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/24951341713.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/2f7566804d458482dcaa3aabfacf021b/44932811652.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118b8843dcc3---78098857583.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/63773717176.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/laxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=writing+algebraic+expressions+worksheet+grade+5PDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 11340 bytes
SHA-256: f9f00d29a9c87b8ec5da3d48acbe15b8224c370c0ff81338869b73b49ec6e85d
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 17364 bytes
SHA-256: 6aae2406214a6b00c8951aaa81b21f24dbf985400355a006a3004d4f8ee919ba

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