Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d61cdf8f34f09a…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 06:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f503453cd50376a579c7574c7609ca06 SHA-1: 08e919cd0a999971e94dbab778d9144bae4acff1 SHA-256: 59d61cdf8f34f09a99f7543795105880beeb330a5fc9bacb3816e1cb1992827d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites, which likely serve as distribution points for further malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true origin and purpose of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607522dfa064e---xoxegelimefidetumuladepuz.pdf In PDF document text
    • http://eurekaelearning.com/upload/news/file/88055666373.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc3e95fb2---27097698380.pdfIn PDF document text
    • https://renetravel.ro/images/files/pisopasozepelevazu.pdfIn PDF document text
    • http://biomehl.com/images/content/files/moliruzutuzetor.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/nolajomarokidux.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/97d9c7d93ccffbc5f08a9d5548902d67/66124832044.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/lipukufelepebi.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/xegagasuwuboxi.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/juwasizujipowevemig.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa7d1f89ae9b7a60b7c8afbb0a5d5a83/vufiparo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b847d69c---tigaliv.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/lelodawaxegadegutufejap.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7bjgrulqt0m888a05rnrj6qm7j/kejavo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae061ec85---40389432384.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0001e7de0303fdf70597702fc9d76e1a/74585528633.pdfIn PDF document text
    • https://udruga-invalida.hr/files/rowosebijibuvutekexemej.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb295880eb---furanebumagamoz.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/78bbeedc7771ad185712ebfe74531c79/88714370514.pdfIn PDF document text
    • http://anm-av.de/uploads/files/79952705918.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/megetazetezumafikonegujon.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d06aee3bafd---pagoxikisudabunobafew.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/rinure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=abb+watermaster+instruction+manualPDF 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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10696 bytes
SHA-256: 9cb56657e2b9362395833defe15a880b0fbd8caa2437302a490ca5fc82051f98
font_02_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 17800 bytes
SHA-256: 5c99a76c70ef8a6b1c279b2c4263cb0defc15245d0bcc9b4c95b51cce0463cb6

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