Malicious PDF — malware analysis report

Static analysis result for SHA-256 82993213c841b2ee…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 10:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c13b78610584de7c05e79796e50a7fd8 SHA-1: 34a922131648a83885c5a4ab6dbd80d996cecc8a SHA-256: 82993213c841b2ee08b4f49e7fc2a04ec4cd3559aca44ca179bdb083ef5234bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly indicate malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=speak+out+elementary+pdf+free+download PDF link annotation
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a3f56c5f89691bfd1cdc28df8449b1c2/64055465285.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/s88lvctemds809gfvih5p57qob/98104320108.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6416a9569b8b50a72652fcd00b1834e/90755813994.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16094273877a80---sosanovuguxufimigo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f64dbd232---ruzezewurebolofavawa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b37055ebd---rafowujukuzonukupidi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/3176201180.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xotogizifu.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/60745413080.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26eb98578---35004066388.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abed5f342a---kofinaxuvaxomuzujib.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/wonemonagetovomiposeloma.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096ab624a5f1---xixefixelegokusitadipefef.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/9756396327.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3c3391f6aedc60ea8e85024ea08cba77/xuxevowom.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab288679f1---95180166598.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae70c414ae2---zipemanewoxalofalimokexa.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607872cab6f63---85234233218.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/a7619ca599eb88b422f1cb29a001835e/54568571667.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/lufukekexozano.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a33a02788ff---zazodomajalokobosugaz.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608611a39e24d---11544684922.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/88304075068.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/vanewawakigafavomujelawuj.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lorufativubazulal.pdfIn PDF document text
    • 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 16848 bytes
SHA-256: b5efd151e792631d850290b87e8dc91c8716a343dff0990b918596a569f71481
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10868 bytes
SHA-256: 591427a00bdb5362b2a9dfe3fd41454d877cda7535c5efb720d3c23361ab3222
font_03_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 16728 bytes
SHA-256: 17e381b805021256de9ea5e05d24540390107f4ddc3e46dc1d612c01a0c763cb

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