Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d503b13b44426e…

MALICIOUS

PDF

96.4 KB Created: 2021-07-16 03:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c33bdd8cbb418caa850fe25d3710cce SHA-1: e80e5b1da0cf4462b48006851e329f89cdaa2144 SHA-256: 89d503b13b44426e67c816efda6c0a12d93abda28100e8840930b62f25d67195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as a distribution point for phishing or malware, leveraging common vulnerabilities in website plugins.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 6

  • 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.
  • 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/8rsh1p6tdurtupimli8pk79ic7/wozidujaxozozigoz.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d1af2ba9cd4fcd22c8c7d04c9d66f9f4/fokugiluvuzukez.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b21a0c643---53675889712.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/xivuvumowopesebaf.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/60851515020.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/218518743.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcea56c760e---90054094968.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d899c79d---66509549262.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5cfd5aab---dozovuduzu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b76b64aa---vupirilapafej.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a3da2773a---5633937602.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3245aff8---fibowixawefujegafugo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/72a866ce04779cc62bb6c87f0ef01d01/vogexajapizenezigiwumuv.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/76dc71666c6b0e36e484835a99f1962d/71063071399.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc5d40a671b41dfee8475ae920514b03/xiripi.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/21328863813.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92ea2c7933---netubimilevatevabom.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f968286d27---tawuruzenupewilem.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pawuzikemik.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771c401ef66---birenepirep.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833fba153b7---93431703480.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7f20772453acb7dfd59c33c23efb5588/90344466668.pdfIn PDF document text
    • http://hasyo.net/files/file/fekobagutibil.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bbc2318af5916909c20cdd9098a9977b/19815837949.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/raxepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+patience+of+aPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10224 bytes
SHA-256: 97023c3f754f703032db68a838b94e351a20c7b01a37cbac1f296ac47fe3913a
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 19680 bytes
SHA-256: bab791715285ea21af7f89e9b439d02ae9386cbb650c1ad2a20b58d6fad89fa3
font_03_sfnt_off0001515b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515B 9696 bytes
SHA-256: ea40b535ea168af5ec14700b2440a18e33f9d279e5b487f6c93a0ac03797a401

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