Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2ab2c62c54ff92…

MALICIOUS

PDF

96.0 KB Created: 2021-07-08 11:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 10784a98da050c638561e2dd8425e40c SHA-1: 8a8ad816ab12fd1b231d9e73fb52b8f7831617b3 SHA-256: 3c2ab2c62c54ff9234ba93113d06a2feb54454bc3742780dfa593cd23f93384e
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 upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The PDF structure itself is a link farm, a common tactic for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://geluidsadviesnederland.nl/ckfinder/userfiles/files/19540369569.pdf In PDF document text
    • http://vako.vn/app/webroot/uploads/files/39424947156.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qr38tafbr753ak1dsn7kv2c7u8/wosimuvep.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/tekip.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2a501722---rekejutifigoge.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/e17402606011f130a8249caebede0938/dutepufilomuwepoxu.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/jusazelinekukik.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/546972d8e6936bd89032ba150f45e140/falusokoputemufi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/md88r1nbe5hec5taml1sclfg23/fijewiwakin.pdfIn PDF document text
    • http://myredm.ru/uploads/file/givunogesulonebakep.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0314a6f6f---42930373689.pdfIn PDF document text
    • http://prestopc.it/upload/file/fudunofupexorigujuko.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16098aec9ab74c---pixowexosixavixukejulix.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/monigaxepefo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46936c43bf---55555769648.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2ffc1aebc5a18ac01afde5a799ed8a61/36219629460.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1446942414608d12d613898.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3bc9ffe15df2e06a354d3fad51827a64/24580246624.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a1548bcd1---togovirugojovu.pdfIn PDF document text
    • https://peterdegendt.be/file/13459085775.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3179cea8d88a63c6b5f900442c860824/duwajanakosej.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/21035428328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=practice+standard+for+earned+value+management+second+edition+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_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 18760 bytes
SHA-256: 5aa5e512712e12c43401f238f40e45e495e90d5ca801f8bdb6390566569e444b
font_02_sfnt_off0001583c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583C 11132 bytes
SHA-256: 8831ecacd2127befbf937595642e364fa2f36707d53892c1c49f4451d48add22

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