Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5594576d301f7c5…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 14:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4476cf0f84563727d5b6036528a85a5e SHA-1: 2989c01e7724c8fb4b1d8abfa7665d0cb68f6635 SHA-256: d5594576d301f7c5db2eebbed9806a157c5f7ddb682df37fc756604df1ebb823
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The primary goal appears to be directing users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://stressmanagement-karriere.de/userfiles/file/10624563627.pdf In PDF document text
    • http://smclassof57.org/clients/34860/File/zexeleropuropigutidexa.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7686fad2---91923981554.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2938efb3d666c687b210d69b3e40b2f1/98593746775.pdfIn PDF document text
    • https://artbynela.com/uploads/file/31471139245.pdfIn PDF document text
    • http://nensi.si/upload/file/93220680603.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1c7fa11857bd12050347375c9a25553f/libugalotijedonasoli.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/44291984157.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/50uhh0l1r6cieeajcjqqlmk3lh/7660090303.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/45369436201.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/10827301327.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210724_111743.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5d82441d1040fe0b68776dce660bf77c/kunebuzonukuxoxaj.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/23433114213.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/99820576671.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/mapabojoranemumolixexatol.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/zibadudasudigepupumasav.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pipir.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a5973efa113e2213b64549cf7c3a0e94/59228578331.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f788be212f---nekukokawovi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a11a7765c94---ruwunijodovagakaxigaparoz.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/noximixowejebatigemawomek.pdfIn PDF document text
    • https://bak.vn/upload/files/36631199577.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111987b2b72e---fomunupiwevavose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scoring+jebsen+hand+function+testPDF 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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 11152 bytes
SHA-256: 47bb8b8d872b768214e5c7db5a8ba15b311f043994343cc6942705e1f2d96b73
font_02_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 17868 bytes
SHA-256: 1d67326a95bea3f25418705b5167049a77c6c0784ef96d361f0fab81300fa719

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