Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52c64cb853d91a5…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 17:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 425da5fa0f79cc16111192027fb5a546 SHA-1: 35c0a651a1e004a999f90cc31e772799de5a863d SHA-256: f52c64cb853d91a5c4b4a3dafe1db4bb8e61c331a44a909ef443e9651003c108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/25ea7fc358e9e1213b5517ccf10470af/sotemelekuzubuzetoje.pdf In PDF document text
    • https://ip-pharma.net/data/files/piwefilepesu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/6d8e6db298d87a8fd00b52a179052844/zeluresaz.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/lajomupifexamivalug.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/73229344867.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/53069862811.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/30827163512.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/ramawegedofenevutu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/72984352360.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232828.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613252380d96d---78338001859.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/sajujujob.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/dugunig.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/mikiworolireburisude.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613085195328b---meloxatinofaja.pdfIn PDF document text
    • http://ttc-investco.com/img/files/zevutodil.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb6a148ea---57987632987.pdfIn PDF document text
    • http://topflexsports.com/uploads/15050821180.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/23750695697.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/tibaruxewurevukaso.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/79216709400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mark+crilley+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/zazoledid.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_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 10324 bytes
SHA-256: 646a5b16ff6f99f360f575811f0525701694d765ad2b2f658fe018b079235380
font_01_sfnt_off0000eed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED9 16716 bytes
SHA-256: cd181bc5cf4f4b7ad17b011cb718463551e3f0a26e080f0a43270ce45c4f0252
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1