Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b9cf5973818736…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 22:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fed19592588481dc71e6ce07f5ce105f SHA-1: f34c90dba0b19f7c6eff0f22b4cfe13b81a46689 SHA-256: e5b9cf59738187366fdc1855b09c0c101f4b51e1e4b03d15d396538db76ed7d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It 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 presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.zywawiara.pl/pliki/joxibor.pdf In PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7dbbff5f---34832527191.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d439586440---kukewira.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/94572707309.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/48745319716.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/t3o8k1bd59oadvm26jqmk86o0t/verafowe.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/42903725782.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/70863382499.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa80bb2b35---13062139623.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewubabadu.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/likepubibitukuwifes.pdfIn PDF document text
    • http://balone.net/_upload/file///23067132018.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/zumixalajeruvunizut.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/xugapisofepaziwudonukuzi.pdfIn PDF document text
    • http://446888.top/userfiles/file/99689934697.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da07739f28---91630065756.pdfIn PDF document text
    • https://t2sc.me/userfiles/53922828666.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/47790553328.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a9e1532d0---2699117996.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/17306a97c2ed48d1cd93fcf4d8f65617/godelax.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/48391679659.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-07-30-02-11-25-OeIpmvYA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2015+s550+coupePDF 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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 17964 bytes
SHA-256: c9e7033153b2c3b9aff47c4a6e16657eaec3860ede620356f721981edd90b6aa
font_01_sfnt_off00011007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11007 10196 bytes
SHA-256: 72ccf33955e3772fffbe372e681f90deec061bb0b2879eaa633fc73a7efa91c5
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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