Malicious PDF — malware analysis report

Static analysis result for SHA-256 8764e90c71e073a7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 08:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 770b88f7ac2d499eddf31e2fa060ebc5 SHA-1: f79ea9cc01751c4cb928744b6fbb05ddacf2292b SHA-256: 8764e90c71e073a7f15dd27a877523336824cc857f062248455524d27fb406da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/nubixonazevijekinako.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/75041986531.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/6205337370.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/88374092691.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/numipuduz.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/ziputo.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/12172226023.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vumuv.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/6117427207.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/teguvibusaf.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/nemopowogakade.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/28b1f4b9235c0fe2c7d1603bd2d21524/wujamisuzinixurasoxomideb.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/72420003735.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/lakafakexugiv.pdfIn PDF document text
    • http://myesen.life/userfiles/file/pufurejusonufitowi.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76993c1ece95c8791662a2e056568b72/52125402305.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139636619c2e---40750265655.pdfIn PDF document text
    • http://sb-78.ru/files/file/togigexemizilejajulupep.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rusakifanekifa.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/dawaduvagerigow.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/65205794364.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ca4237fe7dc8cdef717d80e178c84ffc/lozif.pdfIn PDF document text
    • http://bluebossa.pl/files/file/setejuratetokamegizip.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021919725543562.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/womim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+apk+periscopePDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 17968 bytes
SHA-256: 3db6bff596c06c8813cb729d6a5e085bf90214a817ddbcb96d105f91f4a5c92d
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10588 bytes
SHA-256: 198a11b7a0db5ec02727e55294560e50ee570d41c0700f0ab71ce2b38832481f