Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cfc9e183d16f1c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-10 07:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78a89c803fe9644ebc0e10b2072642e8 SHA-1: 304c26cae05b9f9a2a0e466b624ea172d5b8b8ad SHA-256: a6cfc9e183d16f1c30eb80e9049656859f344ec3b96d48e52ae7f8d96eedf6c2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gruppocinofilomarsalese.com/userfiles/files/59356521205.pdf In PDF document text
    • https://namratalakhotia.com/userfiles/files/lujoruvokogigetox.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/segozawadidog.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/88176579517.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/78299027932.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/kuxan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137d92b6dbf2---90535045622.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b2cf39a4fcaf84a668c891c9e9080bd/xuxosa.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64905968230.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/36716806947.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/3893221574.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/jisibibegomutozufere.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/supinifit.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60362164082.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139db1933b22---94092063745.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/rutoporolejefeboj.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/12522593444.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/dereninat.pdfIn PDF document text
    • https://digireg.se/upload/33177580748.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/roneriwifulisikafuvubibi.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/dasakom.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/48850609349.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/vipojikizemokibedenimezon.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/26024607342.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/51634980267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=book+of+basketball+pdfPDF 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_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 16684 bytes
SHA-256: 09a988ce7f4dda67b94acc1cd8146a823844052cd4e1b27562192469f4eae876
font_01_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 10480 bytes
SHA-256: 3d8387623e5d9627b8e8114e50672e7984f82591fbeb159d794aa2de7122cc0f
font_02_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1