Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aef53599cffea96…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04e67726c980fccd33a1ff95ced74263 SHA-1: 1a01ffa0fee8d5722bab27bb8bfd5c19b98d3146 SHA-256: 0aef53599cffea963071a642b2bfbd54606d7302c43d6127b35c5c9134db1c47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on compromised CMS uploads and uses an invoice/payment lure. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely a phishing or malware download page. The presence of multiple compromised domains hosting PDFs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e1066151095c11544bae218454c582d4/88246325212.pdf In PDF document text
    • http://gowowdeli.com/uploads/files/muzusisupumazogaxunude.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/65863933349.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d0122d069---24068840211.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/gomizeniwojazizopogibi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3675fd79f8---7497259100.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/95788487101.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/26ajhi4t994eeha2l3sbd8q1c6/67404237831.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/42181241324.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa60b7cc7---72690787121.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd539106d---kidugizisoxisako.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xudugujadus.pdfIn PDF document text
    • http://dogable.de/userfiles/file/lilidadotijavagipexes.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/dlg5cpgavfokvka22te6la2rvv/wajolorelobimate.pdfIn PDF document text
    • http://martonelektro.hu/files/file/xipinorevavigibobav.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8d28b232ba38b37b0d35893a1ae969b7/85965607128.pdfIn PDF document text
    • https://geniodelweb.com/file/85512450938.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf24b9a72f---30988268016.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6912bd41---50917697531.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5f7960eea6032ea3ce63b58c3f752e6c/vipixotefoju.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/9625650428.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100940c0ba2f---41634396491.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc61fd785f---godebonamojesetokusag.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/ripuvazizafijas.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/48619916063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=receipt+of+payment+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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA12 15252 bytes
SHA-256: fcb4e6bf295a2b8c6255d8d6707d06b503f4d9fa0e0cc06203f832767e7b75d1
font_02_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 10624 bytes
SHA-256: fa66017157559f7b78776a5e00bf298b2fa59a850d321ba152cea0849fcbe835