Malicious PDF — malware analysis report

Static analysis result for SHA-256 e934214d739e4705…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7dcb4fc81ce8fce748b155b0a9fcb489 SHA-1: f26fa7e71e1bffd1c590aacc9f7a3623f9d3fee4 SHA-256: e934214d739e4705d9aa402b4d038e5afd7026dfa0aad69cf62b79f1b0f3684a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content, contributing to the overall phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://trevelsi.ru/ckfinder/userfiles/files/tidijaxekezuzaw.pdf In PDF document text
    • http://studiopedrazzini.eu/userfiles/files/67898715081.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/19365021784.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358aa97dd73---kimulolugimalojowusosuz.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/66693456181.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/12798462128.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/27889036987.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/foris.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/35523066833.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/4955329383.pdfIn PDF document text
    • http://c-six.it/userfiles/files/foxurixexapixedizisugol.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/6178814539.pdfIn PDF document text
    • http://headrepublic.pl/images/files/43045699822.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/90518267618.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/vorivawokanefodonafanafak.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/padedozopixiduzotibozukud.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/xenibefemugotofikefugese.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16135731b96f31---mevixapozukagefomegufosa.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/14420498034.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b321049c15---80138708802.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tawalodepukojebet.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/5423349813.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/fukasuxujaverizuzipi.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/moroderaganuxivujagedir.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/vuziba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dosti+sad+shayariPDF 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
font_00_sfnt_off0000cc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC85 10180 bytes
SHA-256: 9d5f376b977943a1f1a38ea344fda069dedc0ff7ee28f42bdb01c7a7ce98143a
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 20564 bytes
SHA-256: 8f1452dac3f256fab2aa3f92691f5e1d74b857040dd208830454b0db23bb5744
font_03_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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