Malicious PDF — malware analysis report

Static analysis result for SHA-256 8748dacd874394f2…

MALICIOUS

PDF

76.9 KB Created: 2021-08-31 19:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9a70638783ab8dcd4d46325bc9d8df9 SHA-1: f68547a210a94b54c15dc7d0009894d29e794abc SHA-256: 8748dacd874394f26ee543965a049c975c4610e982fc94915130ada408e4f584
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external, potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=what+does+it+mean+if+your+flying+in+your+dream PDF link annotation
    • http://studiotecnicodama.it/userfiles/files/14366302809.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3ed6a04fddbf2b4d2ffe95896d25dccd/kixuni.pdfIn PDF document text
    • http://jawarakreasi.com/file/buvidagikepowabenitetor.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/17734950329.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/64515240212.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/xenovid.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/vurupibufifew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2f2d4f46f---76422364625.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/24463751635.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/403909780.pdfIn PDF document text
    • http://ttc-investco.com/img/files/8413943956.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89352201045.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672934fb83---27458351972.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/kinisewi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/58334648125.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/nakusesofab.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd07331ed3---fekofoz.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tadonujado.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/minipow.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/r4976745pp594jugoren2tn0aq/memaxetajetoso.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/kubukewibema.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/16711129765.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_off0000c8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DE 17364 bytes
SHA-256: 66eb8eb15089081ecafb69f599a6f95de70144d2a3e86cc6486789d3900725a4
font_01_sfnt_off0000f533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF533 11008 bytes
SHA-256: 54712a5a6c387ae4b83a0712cc856bef5c5a15d5ac5a86e0ba3d715f416147b5
font_02_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1