Malicious PDF — malware analysis report

Static analysis result for SHA-256 2831d058bbd3a584…

MALICIOUS

PDF

87.5 KB Created: 2021-08-16 02:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d7c1008e3e2178ff56aaa4bd195a6e6 SHA-1: e2092dbf7d3272f45d94fda4b56db3928ef1e66a SHA-256: 2831d058bbd3a584435067874a3b1175cd31247f1be7e9f6f367e7cdf0f697bf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting a lure for users to download further malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of external links and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://weilandensemble.nl/ckfinder/userfiles/files/vomive.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/17672391970.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/81723810237.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/8936da6441dc62f53f9180fddd3cdec1/9574970933.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c202b40c400---97602552434.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5965ac8a071de8a2224ab993749690c1/getofozesike.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/ramevanewedilop.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/83216200854.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/38068278463.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c089750cd5ad5f663de02e74d306fa2d/21583844565.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a07b4a716f6e1388cb427c9e67b4bd40/63045223849.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/7615577610.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/84073565427.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742225be118---58935076527.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/82653270868.pdfIn PDF document text
    • http://apismorava.eu/docs/xawivovuzod.pdfIn PDF document text
    • http://runo34.ru/attachments/file/49197981654.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9a78827af---kidivafulajuxuviwufan.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/mivakalus.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/55072335778.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/gowosigasigagutedejado.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c497408c1ae---87446547688.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/22839355540.pdfIn PDF document text
    • http://reunionfamily.com/clients/6/6c/6c58f7de0247188f02debbcda007d80b/File/wutibusawimeveliguzelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=como+sacar+pasaporte+venezolano+en+colombia+por+primera+vezPDF 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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 17844 bytes
SHA-256: 9cd7dc6ac88d73a7f2e17d2c47e5b78323bea0392c82ed4710bf44b382a52906
font_02_sfnt_off00013365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13365 10832 bytes
SHA-256: 856ebfc0edc814cbecceb62131e1406b9fecceb62174ff577066159961df531c

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