Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb89615a3bebe45…

MALICIOUS

PDF

87.8 KB Created: 2021-07-26 02:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5397641aa47a07b1287ee94179c8cb07 SHA-1: 7b4a022ba162575e58755da4eb75b088315fa584 SHA-256: 2fb89615a3bebe456bba0ef060a1a8aff6d96f30a7210fc7bb27500b44fad81d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, are primarily used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086421881e3a---xaduv.pdf In PDF document text
    • http://gernano.eu/gfx/userfiles/files/vopokakis.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/60593457466.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/joxipipujuv.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jnlk2rhr6hfels2a4rrbefjgrv/samij.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1be74dea848da4a877b1f862ec0f5ec1/2679161240.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/waler.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3e918edf2---kivenajekefovilawoda.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/40784091099.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/tedawitesopozofevepokivu.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/nifusaji.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5b068678da3f754fc481221f620c1d92/ridujapox.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160905b6fe5cdf---55274772647.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/57807755563.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/rabis.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/guxabesupuzamidiroli.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jisarusuwoguresef.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160769323103d0---xegolufelevitubozesi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb5a77d3c38---2099514722.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885bf352ce---9949254257.pdfIn PDF document text
    • http://ttc-investco.com/img/files/51126798426.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/b6fb37ddaa4bbc0c8e9b63b36f7ed19d/winoka.pdfIn PDF document text
    • https://soechi.net/userfiles/file/notuzefa.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64b4163003---44974374076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=minecraft+for+windows+10+free+download+1.16.40PDF 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_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 16348 bytes
SHA-256: d535ff985416741e1dad1c2526667d30a4d7b95f3b2bc63842b17ccca56edd00
font_01_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 11032 bytes
SHA-256: 8e1dba6cdd81316ef46b9d92de69bd55cc05fe7a8eb27d5b5dc9dc0940a48d01
font_02_sfnt_off000137e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1