Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed9660ccfdfb9b…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 05:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76a9625a41d5e976968ece15faaef5cc SHA-1: 27e7dec21377b719f1029653e3b4279ff72250a4 SHA-256: 86ed9660ccfdfb9b97cb481caed218f0f174629e2ccfbde6caefc88afd611104
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. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The presence of these links suggests the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=green+building+with+concrete+sustainable+design+and+construction+pdf PDF link annotation
    • http://abwingsmd.com/uploads/files/tuvadonele.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/voxefuxobosama.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108021710074076.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/dowizalabufubusidipidir.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/99942208476.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b60cf32e5---65167964381.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/15879378926.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/4043266330.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/96809131071.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/12331112672.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa816050920---timukurivimexenom.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/400741fee3a996c7f2ac75c8a4ae1295/vatujigita.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa682dde---sasazevoridiwirila.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849acd019c5---xagemitem.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mewivoke.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8732f25191---87025415578.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/57911808303.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/726fa7bffc68fb1e64242526136b43f9/5168810806.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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 11264 bytes
SHA-256: 38cda51a81704901307e59bff43ee4850a5ba2e7c44fad7308cb8a4f392f74f3
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 18420 bytes
SHA-256: 7e813e1eea788cc79fc059218fd808f24c30c6d1d4d2d8104b51721215cb853b
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1