Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d75c6cf561c5aba…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 03:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e4546c9c3d0e22216e7956214283deb7 SHA-1: 694d51839eef4d2ac4964d22a998fdb66c5670f1 SHA-256: 8d75c6cf561c5aba08c0e2668a403b2a0db752dcf8db53fc3b93755faea502f0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=how+to+take+a+nap+without+sleeping PDF link annotation
    • http://sevimticaret.net/userfiles/file/86159156884.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/suqp43vtckc9k0cv0uvg670v01/48889264352.pdfIn PDF document text
    • http://winso.tw/userfiles/file/kibof.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/seludunula.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/134ae0d99e705367d73c01cd10ecf377/14573615045.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/suzadegotigiwilakud.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b903118---70335193061.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6s05qtvtdj7r1rcudrn1sc89e6/52668775573.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/koburozigujemori.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6e2260e254fb7d9d7119c9352a8bfee3/66410074641.pdfIn PDF document text
    • http://nfc.soo.jp/file/66325025974.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098345f499ae---dawomozelebilugitexan.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e5d6dbae---39595330598.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c306fb029c---28154761954.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e0dcf9be75c43ad975d01606dd1a7021/73640325039.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609274a52b20b---39773771646.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f4283b52---borubabaniviwelegago.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n5tb76obbl25q25shmqn7dvfkk/girirakurewi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160799df543f13---mepuxopalu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7758646338e49218209e72f64211cd10/54218033893.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f083c1b6da49b7f3d46271fac02de246/lewiduruved.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7827242c23403cef064e6f60c3e4d0e4/miraposovijip.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/924c242e38c78f1c5ce94bdc8672e27b/zitikipak.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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 16880 bytes
SHA-256: 69d826d2fe41bff32c78e4efb9d2c7390a21ca3c61b85ba193c3a4f12501a172
font_01_sfnt_off00013102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14919 10700 bytes
SHA-256: 212e1ffc770e1e046d0f5410d4a802d60299f6d8212b0e2da7f816e3aed57ca6

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