Malicious PDF — malware analysis report

Static analysis result for SHA-256 f252c43f456b38c1…

MALICIOUS

PDF

78.1 KB Created: 2021-08-09 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6b5f7b0b47abda29e9131c28750dd1c4 SHA-1: 31d81a7c83642fc9313cdcbef9aa0a79fa5141e8 SHA-256: f252c43f456b38c10dc056fd329529c937311b2bb3a4cb10ffa1533fe3d07f10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://pistant.ru/uplcv?utm_term=punjabi+movie+ardaas+karaan+download PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/bofpjg6ltgp2o32odusjq6g9l9/tedonigafolibuje.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/defigagikikup.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4665dd1b1c---44812397618.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/dikokonugabovubitez.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875932224ff---xujizino.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/76251516474.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/52526167597.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/27c0dd15278a9b991342ff8305ab2ab3/bolelapekel.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/dutufetagifekodolateraxof.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/zudujukaxovew.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b287feaa4ee---30931927030.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/9d66f833f78b5697863647a44cf3f74e/ginatabavoxaga.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/goxawagemovujapefogo.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/xuvenusukuzapisitoliki.pdfIn PDF document text
    • http://byecook.com/ckupload/files/fabavilalavopov.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f005670292---mekimakaketut.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/ffd554ce99b0f8818c1abb22d5bbf2c8/xasudegokimedosit.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/80703733399.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a70c1307---2152005437.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7f149260687eb978b30c49878384aea7/wexanabotanoz.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/31656873539.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/21741105929.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e838518722f8812d80a2c0ce62bfb243/19059558701.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/cc7781cd88ef6e8ca6c930a6bb02226d/siduf.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8q51rntgk12uik7hi8f7i0q223/kakusevobago.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 10924 bytes
SHA-256: 6cbed4ea8c2e7a9cae190ee306dba31000b401ff38cc073c06c1cffec29bca30
font_01_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16896 bytes
SHA-256: 25790afe626908e1f464757b1a872b7f60ddeef7b9d13a557d33274470d1dc23
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1