Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81d0dd477abcf9e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 08:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f5782c983c05eca0c877ed82fc98a203 SHA-1: 078c60b26c62172467100539511bf41102d4e3a3 SHA-256: e81d0dd477abcf9e54eff77d6e3d931f80a10eaeaaa2381757a5910e7c521a7e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://designclarf.it/file/wovedineditafetikelokuv.pdf In PDF document text
    • http://eternoohydro.com/d/files/vegumejotuvazuxu.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/rorodolasozemolalikuxubo.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/jekoselikuti.pdfIn PDF document text
    • http://nfc.soo.jp/file/82294626360.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/sawuxavoradanowadiwesolej.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/13679541687.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/foxogemaxekexu.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/vuwulafemafudilexofow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f5bb982e2---45347966685.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607df33238bab---sojiteregagibalote.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088b67803c70---tisovigalato.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/82jomh72e6m4gdgequae7bplep/telizibuvebeza.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3329b5db0b1cd3a56ad0d35588baaee5/24969736894.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789499a93e9---19579251611.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/3dd26e57d661703580ec30238e0d78cf/64676344422.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/96865566487.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/zoxewavuxigutalura.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/xiraleregatapo.pdfIn PDF document text
    • http://lucann.com/Upload/file/zakowidubixilenimixenefa.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/24102057025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=volume+of+a+truncated+cone+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10896 bytes
SHA-256: c4cab2add84428f255013a422d7d74b088268b0fe4e99e5e4f63c897b2d778a4
font_02_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 17604 bytes
SHA-256: 9f17ffdbbc17b426dbe6c1a3694bf9735c38a28815e46ab2109e11314c7f2122

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