Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4715ec25be30d94…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 07:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee30f0ebf7cf349799ffaf22555f86c3 SHA-1: b6638b0d33fc99f8f83785bfa0c49285e874577a SHA-256: e4715ec25be30d94517c5622ff307353cce4bd02cf2e288b4218fcb744929b72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, such as https://coretry.ru/uplcv?utm_term=architecture+annual+competition+2011.pdf. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=architecture+annual+competition+2011.pdf PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18bead8c6---wenoton.pdfIn PDF document text
    • https://camelcarpet.org/d/files/susewe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dce42d154---66861218771.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pebetesasoni.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/45969504049.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/00feaaa89edaf07032c7b57bf120f053/fojixodofagiwovove.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/tirojabubalefusazag.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/s1qag01h0esl3ef9lu5t4oalib/sarupapinituwivosoza.pdfIn PDF document text
    • http://oprfhs70.com/clients/879438/File/nasibobujovebutetojorenax.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/73562126695.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/rubagupifi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/0j9h8aj7ge8m6iqjpgpu8q3vj8/11199818919.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/23621673449.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b74b8f878a8---zozimejemidovewosaviguw.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffca16f51---87717599504.pdfIn PDF document text
    • https://ikansambel.com/contents//files/12836908950.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/65221428476.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/28495458668.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0928058361---motujomovumidopo.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/96036523974.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085865fdd48d---vefijo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f87c42ba251d631c5ec15d3018658ffe/68060420482.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/4792708429.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/24148923374.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_off0000b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 15500 bytes
SHA-256: b1459e22b80a11172f24ead03fc998bdc2baeabb0bec8bbde456254f8c56abd7
font_02_sfnt_off0000f7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 11160 bytes
SHA-256: 446bc1a9e6499f6fc860dd9e9a7203fd52048f0413c3f673f2f63da431b00ddd

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