Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42c6eb13ebe5d74…

MALICIOUS

PDF

99.1 KB Created: 2021-07-06 05:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e15ad3d5ab9f620b12872426ac4fdf4e SHA-1: e15dec30571afca0cb9940ef93946d41043c9958 SHA-256: f42c6eb13ebe5d74fb04ea13303e9d662aebe9b81e49afe76a1061fc1ad12c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://nomylo.ru/uplcv?utm_term=gcd+of+3+numbers PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/gh50t9bid57k87gmf75me8e5l0/sigugudorimiligozeluz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a16314d6621---vifadadadiviviwifob.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83bdfce32c---22316810056.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef00738dd---xobujutege.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7171eacac---peguvapakofulekazoki.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160848db5ec1fe---38700662316.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160967f9b34613---devasozifedat.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_163246.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c50e0468ca9---gudaseduwotew.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/350qgl09airmnugmlgup27vnl0/bafetugurikumaxi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fff2856636---64431263818.pdfIn PDF document text
    • http://immopolignano.lu/images/wipis.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd17c6450b---13108521606.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/827cfb889a77ad874e6634aed8257ed5/3888590318.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086ae066bf64---nadatasexupozale.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nijolikopesagibep.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/47367814653.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/t2iuumlh4jm5nlgcjm4nirbs7t/zakimubumuj.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kovelubabidujuzafozive.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/416382149608c93dac5c32.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/o9k86esqdm9tqprfetdhp9ju34/sepawisemenizidike.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb3d214---97976488132.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3df79a011b---32843739705.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nujina.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b5d85e17f4078df8311fe09d678a0b04/pinidiwazikunuzogovolekal.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/widetufanikuninimareferoj.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_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12153 18060 bytes
SHA-256: 8afc9549f7a66003663d256328a953fe0b9adcf146ccf9b3419a14e5a3fc9fe5
font_02_sfnt_off000150c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C0 10688 bytes
SHA-256: d1738a186f50e4abab7335544a7554d2c557904d7f7b0f3f4ebeb156fa4c56fe
font_03_sfnt_off0001694e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694E 16196 bytes
SHA-256: d8ac9227fca862c90739a94af5a49f1b9ca4381a1365c4ed5d2c66d5bf44f42a

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