Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244d5608f696bb5…

MALICIOUS

PDF

96.7 KB Created: 2021-07-05 21:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 61ffbe07009bffcba46282220296baa1 SHA-1: 04b03ce12f7f577bc6c7162e10b816c6ecf160aa SHA-256: 1244d5608f696bb5d4e0b0d4053d34b5770a0c3b47599e35d3906cf461406935
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/rqd126hluaqbjnrcp5kb1uts91/kulowixobukepazawe.pdf In PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/83559968345.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/71876d940a08b3d9e4d9fd3c6893d481/tinupekoxoxitapepe.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/85582744883.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/sulejajodulupu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3979ca185---34731799633.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ifgijakp11hmv5ps2ca3ufvv31/99328018310.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/65081312466.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/dfe5614b4c025527af85edbbcfddf8d8/nofuwovabujemi.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/dorotagurovil.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/5265917627.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/5304253114.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba30dbc7b---lisosagetegukibisonomute.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1fc29eb0---75446612267.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/801bb237b29fadec67655bade7dddd4e/91568059004.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c151e26664d---32053024924.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/ledusikajemo.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/busubasiwezowageforaxumok.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094511fc4b8d---nunaviwomisunizire.pdfIn PDF document text
    • https://aspirans.com/files/file/1274106343.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0191d24376---linepajefolafemunoti.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/30bde4f1b8cb8323a234145ea43ae94e/96861338066.pdfIn PDF document text
    • http://aimic.com/userfiles/file/setolaro.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/soguxufu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a5bec691f06a70570f65d632fdb68633/74852386562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=turtle+trading+rules+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_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 17076 bytes
SHA-256: ca917f14eb0847f93b9e38935ad970bf77bdc22b31d0f3141dba1793bfa7c0a3
font_02_sfnt_off00015d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3E 10616 bytes
SHA-256: 5cb70ed57004ef524685362a0aad6cc9ce0fd8e37dc4572c4465d7c52ae66d27