Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c203231c350b90…

MALICIOUS

PDF

89.5 KB Created: 2021-08-09 17:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe0f5e5efdc7942985e575f503b892db SHA-1: 2d395ab9d592af388b39e3689a3025722c168024 SHA-256: c5c203231c350b901cd1661004c2986bc8ff624f5d8c84458f4512556fbac198
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/218036c596b8dc564eb77839ac0fe9d0/11797217107.pdf In PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3f6f7d927700df9b49c952221df6a3d8/xarokuzivopenitusakowat.pdfIn PDF document text
    • http://qzgj.cn/upload/file/51583717401.pdfIn PDF document text
    • http://lyshiying.com/d/files/vixumabudef.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/xanerowojogisi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cec5f6eb---58186806843.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/79355098.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd7360460---51728358292.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/lijufeparina.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/57902628523.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/wenupodo.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/7521336576.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/fc2ec8ad1263bf959d099e2e6f54d126/bomikoxixusimes.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/87c43799cb8268608310c65b040278f7/55774939297.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210623_070905.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/99122084680.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/30963675322.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/1a31ce3140325d7c1e98041c7ea7464f/48907113410.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/991e646f337352712d4c37a46807dcf7/gozimewezig.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/97958433921.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608be8aae7f43---pubusuzimorojaw.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a3ff13071---11547073915.pdfPDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c0c2ca4332a21ff1693d1f3b460a6106/61550490787.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/kolafexewiginuponi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8583f8dcb6---83626841736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=polymer+clay+kaleidoscope+cane+free+tutorialPDF 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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 17264 bytes
SHA-256: 90f9abd60e3e5ae71e10a028edcb1e4cb62c3debb8d99319ab72a790a3afe9c0
font_02_sfnt_off00013d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2F 11088 bytes
SHA-256: d4db304b1c56d333af431d88e20f90f7a0317a0b1a2aea0fd377e7c0a8bdbec1