Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ca7f021c15a3d9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 15:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a51741dc5a9de8d292ac985685c0e8c4 SHA-1: 129cd8559516aa1a93e182f88f0e83c6d88d7671 SHA-256: e8ca7f021c15a3d96f575d191d30dd1e6834c5bfed6771f0fa2d337f9ea4ff92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to potentially compromised or disposable hosting. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a pattern of using such sites to host or link to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/na220msibd7nduchsfevr24q16/14172092657.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161466636c80a0---62690719162.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/duxefaba.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/lonavijevawizulutodani.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/52805896441.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/8062375284.pdfIn PDF document text
    • http://recviem.ru/img/upload/41618862101.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/wofolunarenojobupoxetejaz.pdfIn PDF document text
    • http://hjhchem.com/upload/files/peredibeni.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/35287407990.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/moxeribosorukojud.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/36911830216.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jelorefuta.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/98377699817.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/661d2589730f41ab107b05cf6728a687/belikexi.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/solarukurudowez.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/25843051539.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161398e48ad856---vukexanikugano.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/daluw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcf77ecdc---84097701313.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/98941072333.pdfIn PDF document text
    • http://kd-council.com/upfile/files/85034115258.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/25984035164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=you+shook+me+all+night+long+guitar+tabPDF 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 10872 bytes
SHA-256: 98e7be2cf21145121dbe56e894a0321540c3998679b826cf7373d3e3770b3de0
font_01_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 17592 bytes
SHA-256: 25cae543b544fe617e828cd0695ce776564ddbb632e05012228ae196d08d3756
font_02_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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