Malicious PDF — malware analysis report

Static analysis result for SHA-256 48356bcf2cc5d226…

MALICIOUS

PDF

112.7 KB Created: 2021-09-11 05:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 497d166d3b452abdacf8e408deb7ea54 SHA-1: d403a4cacb267872cb7e8b13c64ffb57702c3c0a SHA-256: 48356bcf2cc5d226b12b0685b67b0e8d33ade7ebe54422bdc9feb3b313a51a5f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm aims to obscure the ultimate destination and potentially evade detection. The presence of these elements strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cegled.varosom.hu/userfiles/files/kaxob.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161306d3c5cfd0---numudajabubepafixilotu.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/bupan.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cd020e28063debb123de4a3bf9a3c99d/18000881599.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/64173077328.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/35056087426.pdfIn PDF document text
    • https://andana.us/files/files/81439401781.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/xekaxeromedozazodafori.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/doburatadorafosiximi.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/58598538184.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wupelemukelobotube.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/durisevalakado.pdfIn PDF document text
    • http://moristas.com/userfiles/files/wapapad.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/paramogaguk.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/jalimimadazaselugagivexe.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef68385a9---85872459004.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zaporagu.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/685vem680ed5bdnb85p108q725/nolabetinivuxuwomidexi.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161353ba1ce748---vopevinaxufonis.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/80435467723.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210910_195152.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kojadopizurobuxuroxo.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/kewomepube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fifty+shades+freed+online+123PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000164fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x164FD 18660 bytes
SHA-256: 434e1f651788a2281910f8ca612455241fd77cb9b67e7dc1c7b0295e1103ebaa
font_00_sfnt_off000132dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DC 19176 bytes
SHA-256: 54a9c8050f4dfa00e120aa70378497e0ce249bade64dd3926085d7c00ade23e4
font_02_sfnt_off00018351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18351 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00019b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B68 10884 bytes
SHA-256: cb6c8819f4123ebb7fa352a3c026dc3ea146d56d91efabb0e438bcf26f1b90e4

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