Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6967aef755f89f4…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 02:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b845367a15f5a3606971a9da3ad259d3 SHA-1: b4693b5bc540bee5851588f8fbf0cccf9390835d SHA-256: c6967aef755f89f4f9dc49bfba0dc56bcdd6c2819571f13d732cd3a8967e0147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://philabc.ru/uplcv?utm_term=id+card+maker+pro+apk PDF link annotation
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/94707068303.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417cb650f95---putega.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/gijulajilajilip.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/11394338316.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613846d2b7dd4---13780343433.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/73693728952.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/ligigamisogomot.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/jaletupuxefigaxipiwulub.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/66058389234.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/ziruxunoba.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/39544785817.pdfIn PDF document text
    • http://www.77ice.com/upload/files/lobirumezixewalurilixiru.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/23451555608.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df189110aef062e3d20b8e020249a3e7/kilogaxuvelus.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/3089554893.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/kiwosulalonowa.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vemozojaratadepelura.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbf11daeb---57151146809.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/36433842536.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lipadatoduto.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/loxifebegepedufamewidir.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/26989038065.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161432bcd6506d---48899963695.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78687440783.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4f3c16f775c8f44bf7bf036cf0aa034f/74504250709.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ei7lln7eqqp0bgbblr0g5klug7/46188427444.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_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 18012 bytes
SHA-256: 4bc0fe2c03a72330fce678f3016aa368e2c6255ede3197c030bd80ca59e87e20
font_01_sfnt_off0000fe7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 10212 bytes
SHA-256: 6a62eb5654db9194b8e0800de7b8650ef72876fbdd8fd8c7a221e152f36e5676
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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