Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d4c8d4670e26b3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 17:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e5da4ee220247aab00d6f410c4dedf63 SHA-1: c23998a37bbb2c4f6d9ea561504b34f4da7125bb SHA-256: 53d4c8d4670e26b3eb5ed915f9b8788fa6a85765cd31b5a150e016c24caeb7f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to host and distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final payload destination and leverage SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://anthonyvienna.com/sites/default/files/file/69437949314.pdf In PDF document text
    • https://liniagdanskzydowo.pl/files/tidilanepegokujoketuxota.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0634e5edcb---nokalobowine.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/dufazamevelodogolu.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/8930838459.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/defagadifesosarunenikutef.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/79641753092.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073f03a3e929---6420635077.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c84523e06fac66a884d6085abb07c4da/jigokakuganidezov.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/kojevudegolawilufokilov.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/54103930164.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/ditobodixinasupoxovigidet.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gavitetem.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gelenatagatemezinab.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/19939832658.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/50816597466.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/46613782028.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/vegojebuzixukore.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba57a2a8a4---56419933248.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74626227422.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/madimolerojiginavow.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/96921847430.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/13127037194.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1a396dd4---dumixasidamixakezaw.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/litupulamebavi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zerovagurizufugaj.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/xogonesibelijokepumis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=maths+worksheet+for+grade+3PDF 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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10736 bytes
SHA-256: be8e2e3039f4d6a19c3fa32c149f51380ebaa5b58aae9a73f569abf37902ba72
font_02_sfnt_off00011356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11356 17396 bytes
SHA-256: 0821022dc66ee6685b33b932e55520ed3526b856736935ac3410376064940bd9

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