Malicious PDF — malware analysis report

Static analysis result for SHA-256 02efe1cbd736ae26…

MALICIOUS

PDF

88.0 KB Created: 2021-08-13 16:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2536a274f6e340997cc3d946af5ec304 SHA-1: 8bc3724adb5b481e3697a97a44635a3352644207 SHA-256: 02efe1cbd736ae266d73e3cca3700e8899bf3386c16f901c84ee98950b217ac2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. Heuristics indicate the presence of a link farm on disposable hosting and a compromised CMS upload link, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lomuzabegijodizojitaked.pdf In PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/ziros.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4edfa77e5---ginimeroveximif.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/mexamifovox.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/5af262feb9747ffa55a6060bf8148fce/fovejapipokufu.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/18993062141.pdfIn PDF document text
    • http://orem.mn/uploads/files/pulugorivovoto.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/98007049480.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/pemigumimubede.pdfIn PDF document text
    • http://moristas.com/userfiles/files/15212477693.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/fenojigugopexew.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/53659654982.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/44231770945.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/84762668217.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/70811901140.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81066f27ab---22564103434.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/14143028227.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/jubipiwumomamaxuvaw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64285943a---57006842418.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/wujuviwijuganidogezebuv.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2621e8b862a6debb2a7278e7b073a2ad/vebakezakurosuxivop.pdfIn PDF document text
    • https://people11people.gr/uploads/File/74536023604.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210714_012534_3757.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/27186011795.pdfIn PDF document text
    • https://kueapem.com/contents//files/70701524378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+are+the+different+types+of+electrical+toolsPDF 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_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 16516 bytes
SHA-256: 1880fc5acbfa4c20e849b1133a71158af0a7648af41fe470b022b723a37f6199
font_02_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 10824 bytes
SHA-256: 423770c873c73cfa133c292e1f545d975079ad9804f2739de8f0776d82568ddd