Malicious PDF — malware analysis report

Static analysis result for SHA-256 5242c07228979707…

MALICIOUS

PDF

93.2 KB Created: 2021-09-07 01:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 042c06445b2af1edead48f72962a0357 SHA-1: 5df6f6c89635a48cc9a6bd32bd00c6a815ed71e7 SHA-256: 5242c07228979707a273e34dff39db8db526d45914eb6f46bc986322a6362133
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content. While no scripts were directly extracted, the PDF structure and URL findings indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://tonwen.org/userfiles/file/94368738140.pdf In PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddfe5c4de---86585448591.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ce53fa3---tizelidigatuguvida.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/mozut.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe2bd7962---78971549736.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/42855644178.pdfIn PDF document text
    • https://j26clean.com/upload/files/64281824375.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/luzosok.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849c93e72c---nefotategizuviwajufilapo.pdfIn PDF document text
    • http://kustari.net/userfiles/file/36228461705.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/venirovoruzowejotorid.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/52794665498.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/51540608519.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/75746832364.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/35549659444.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/puwefef.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160930a13643e2---98343806008.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/213749831561142e968dc58.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/12611257536.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/24872074420.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/simivejemabivevo.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/7803384012.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/bd0b1386c83917641ca85dabf1ecf854/geligubanisoreme.pdfIn PDF document text
    • https://aashianarealty.com/file/sameravetovema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=crystal+reports+2008+tutorial+pdf+downloadPDF 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_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 11272 bytes
SHA-256: f62c03f34ba06a26e6dc4c45d3a7f0c1407fc522b1a5e8de1df3ad5199407664
font_01_sfnt_off00011a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A11 20156 bytes
SHA-256: 252de561b23638f8a4d4f7146af3f5988d548e48ef2c6c2f5ad2d8677b47549c
font_02_sfnt_off00014ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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