Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9ec5462ec25ec2…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 19:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2727da9c23162ee4d971a1801f819f9 SHA-1: 5567837fad01984eb27c92451beef427abd7943e SHA-256: eb9ec5462ec25ec2767ecc2e1303ee519831087d1bd2fe292a1070dea7d0ba05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a significant number of external URIs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. An embedded JavaScript stream was also detected, which could be used to further obfuscate the malicious intent or initiate a download. The primary attack pattern involves luring users through a deceptive document to a series of potentially compromised or malicious web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=doraemon+theme+launcher PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387991b176f---pomesukune.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/nedarenoneviri.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/jujelolomuvoxoxe.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/95177089008.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/kadugubava.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/36657859447.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133097e403e9---42543538127.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8299f5c3acffc63fb99d654b7dfc0042/sunawuzopasupezidiro.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/pomifizaxuxefiwupuwu.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/12570853305.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aadb9647d9---4482104726.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/gozutososopuruziz.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67972758950.pdfIn PDF document text
    • http://mextro.de/upload/files/resumuwewisotogome.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/50110724364.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210905032652.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/nikajuz.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/26835572446.pdfIn PDF document text
    • http://teifsepahan.com/files/file/gemaximumazuwagu.pdfIn PDF document text
    • http://coolscape.info/images/files/towumunaradudejazi.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/wogetaxeboli.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/tuxozikimu.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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 10336 bytes
SHA-256: 1131179b4bc66ece03376e2c07074e42fc32cdb4018fc4673079c715d15b9b29
font_02_sfnt_off0000e85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 17824 bytes
SHA-256: ab3f779f701b972a8eae398e97d84a130b94e3525b4a7c24bec7cfa6d2f0ad67

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