Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8447d43de100611…

MALICIOUS

PDF

142.6 KB Created: 2021-09-21 07:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0b0d74442e909cbcd06877ce95e3adb SHA-1: 90e381d78d2f6a3bc8416bb98adf4d6b73fd2012 SHA-256: a8447d43de10061195cca2e3d5cae7e2bd46aba51619dc30c20444dcc389d4d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cructi.ru/uplcv?utm_term=vc+codes+nba+2k20 PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161490650a10fa---sugedexelinavuxoja.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/fojalejupaluxipiramumepu.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/tidejuzelaz.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/vixizazonozubimi.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/tulavaga.pdfIn PDF document text
    • http://www.bash.cl/media/file/18353537844.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/9629216846.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/86886093287.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/20413493244.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135210f04274---11278853264.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/kabibafezezivowu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e848799f5---39888217168.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-17/20210917203548235108.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/25789584966.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/zetulomakixosuvibevi.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/76876113953.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/nagupebodijolamexu.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/dijujamoz.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/69130695422.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613686514e55a---nabujakofirurof.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/giwakadizegitujefebo.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/40087342082.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/zidaxifosonilewutupenak.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f60e715818---kosibivoligi.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_off0001ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA7F 19416 bytes
SHA-256: b4c2c19a0ab728e5d193dd7437fa2c0ea3c93678165f1bfbaf319a4d5eebdc3c
font_01_sfnt_off0001fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2148E 10472 bytes
SHA-256: 0f9b295667fc7f447110eb9fd1cf2bc77d2ae053edf6e2a83b9f26819bc3e588

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