Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dde2a4f6dc9251…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 05:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ca8701c0435a0b061c7647a61977486 SHA-1: 06152816344c23118305a652426390177af31a27 SHA-256: 09dde2a4f6dc9251c62869948dbf4f2821b0ab5251ada63f5ee6f3c136075907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://humanlitech.com/files/files/35208373522.pdf In PDF document text
    • http://heryeryesil.com/resimlerfiles/16809036640.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/alm8crn8tj5arc494sqm1rmanf/kovudukubiridimeliwosida.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed311ee23e---19831431713.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f87da1d93---52688597989.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/d00326tthkuh8t40hsqcc3l74p/55114845193.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/volazopup.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/71526824953.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073307b4765c---74132754941.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/rotogesujuniwiki.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f16666a46060541f35a4718194df5629/novitutekimadigupaka.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/49784421672.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/8587828882.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16126dbb9ccc54---bilitolumaz.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/dcd1271703e191562e6518b4fa88c9dc/55835577768.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608162599f143---47133820711.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0e053856966c31a3ae3284db7538ed24/24871940367.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/47940602328.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727c065f0eb---tuwotise.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160961acd26d37---61738715657.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/17764432757.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/38347364862.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/47340416101.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/geruzoforobipofipuju.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/43840983968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ukzn+postgraduate+prospectus+2019+pdfPDF 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_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 17924 bytes
SHA-256: 5fc9367798c220914552e174bb18ae615f95cebcf6d92e9df6eedb01cae78f89
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 11380 bytes
SHA-256: 16cb272fdfd8ded23771c0bc114c06ae0bd8bc5c74d6c32201fbcc6228fb92d2
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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