Malicious PDF — malware analysis report

Static analysis result for SHA-256 194d360b7ef6cdfe…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 09:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f3e0a0d64a7c4a8f292838a066e8ff37 SHA-1: c56e6e288953880ee6580c40d4ef236f4988dc07 SHA-256: 194d360b7ef6cdfe60b41bbac50f9a414aa663e33329389db4e1cbfc61a58e9b
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier strongly indicates maliciousness, and the presence of link farms on disposable or compromised hosting further supports this assessment. While no scripts were extracted, the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/icmbjtp8mrftjo14jc5ladi4e6/3415250271.pdf In PDF document text
    • http://schokobrunnen.com/idata/38929511973.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773f5703330---26704144831.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/robeta.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ab0d6420975da7c81db4914ae13ce50a/kizemefe.pdfIn PDF document text
    • https://europartner2.pl/uploads/duweropokejosi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dbde7ae6c---29572539631.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/28vp81d0jrj39s593rjfunk1j4/tuwobedopoxuruta.pdfIn PDF document text
    • http://flomojapan.com/upload/files/varitidu.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/92556945040.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7bfeacfb5---rozuvezoxitu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b8567b6dc02---kelev.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/514609c907b214d4dc1451f65ed3267f/62709263293.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/berozodadivofanaf.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7bcbb146d---51077351062.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/vapusuzajizuvefolezive.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c73c90c780d094593f8905442725c480/rawedunekigajomo.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a443c9b94f---71020034300.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35824882727.pdfIn PDF document text
    • http://hopsch.de/uploads/file/fepap.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/924cea5b53e3a713dd725780ff53132d/zabedodedase.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7753f963---fizaguwis.pdfIn PDF document text
    • http://babamoleskine.com/files/file/gazobuvipu.pdfIn PDF document text
    • http://kme-kme.cz/files/file/43089772000.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/79290975128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=yellow+and+black+bilePDF 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_off0000f3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEF 10300 bytes
SHA-256: 5b27799a81145676d8a35ecd301786f652789f880b12694aa5092999ef9646de
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 17684 bytes
SHA-256: e62f9112525ca84f57366c6507fd1c909bd633b28e85705a21c44006e5693d99