Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9999c9443df6ee…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 03:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a14fd3344bbcfd4b834b9dc7c3ca528 SHA-1: 9a21935413b94e72dd0d8dd9cd192b7cbba57c48 SHA-256: 3b9999c9443df6ee5560be60eddd5061d42e16a5bdda5c48d23c91a062c822e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farm structures strongly indicates a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=cars+3+full+movie+free PDF link annotation
    • https://indiantalentjunction.com/milan/media/10015982527.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/waxopurasaperuvas.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612eade82aca3---lesokopifukinonuwo.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/22359560809.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1a9d8a7619c1a350fb325a5308babb37/45688896093.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/tirilarodejopojawudunedep.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/sakizipelatapazotoxir.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/19399775444.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/75660215573.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xibat.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bfa460a1f---mibixiniwafoxovedu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/bufuduvubovut.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/dekewejopelopel.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/selarufazumi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/67146195758.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/88328541676.pdfIn PDF document text
    • http://trevorhannant.com/wamokajoganikapilaga.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/29563898018.pdfIn PDF document text
    • https://tadimtursu.com/image/files/sidufixutenomaxazavuvoxu.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/guzijovubavedigev.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/93650143937.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/wuvanudolinatuvejaku.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_off0000beaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAA 10540 bytes
SHA-256: 40a7893a1162901643d6715e57e2d347bda91606cf30a3ab393f4cf75bde75b7
font_01_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 17472 bytes
SHA-256: d29dc3e4385944dfccf1460750773aa033cb5f691e5d6ea0984ba217fe05cd80