Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c51a23f0d4b712a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 07:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 140d6594d4673f8bc5345960d16e9c61 SHA-1: 5f1cf41dceaeb27593d6391139002c33a3def0e2 SHA-256: 5c51a23f0d4b712a3469f4b9fe46d76c3c453d4f4b7e45a0c37853c172ad8cc4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://angelojrobles.com/admin_initial_test/userfiles/file/4994445371.pdf In PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/64943795679.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/gebibuzix.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-20/20210920200852177607.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/leniguwexebovofa.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142787bbf4c0---125052045.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/raxul.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/revojefaga.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219181657466126.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/kagovubawu.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/barawigojepawidelu.pdfIn PDF document text
    • https://iwistw.com/upload/files/duzuxeseravifofi.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/bemob.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/80034623794.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/13148570621.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kipaxokosudogi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fobelokona.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/64601825414.pdfIn PDF document text
    • http://deforma.it/userfiles/files/21812628031.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/77012624053.pdfIn PDF document text
    • http://domplus.su/userfiles/files/tebadijitoxadafobesus.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2a7bf56a---2664877685.pdfIn PDF document text
    • http://ruihuitax.com/files/file/1235061654.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7367114---30878829532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spongebob+squarepants+game+androidPDF 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_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 18840 bytes
SHA-256: 669e04c998d3b504662fbade0cc3d6c0ac7b5a977a66ecb87a6bba8b23b58a0a
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11152 bytes
SHA-256: 8b7065236cdcdb9510462e00b9637dbd763ffc55e8d8fef6332d9d1a29f8a0ef
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1