Malicious PDF — malware analysis report

Static analysis result for SHA-256 414ff9cc79d78709…

MALICIOUS

PDF

81.9 KB Created: 2021-07-16 10:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d7cfd65c200f0b58d07f6a76ffd688d5 SHA-1: c01f818ef0265a8abb9a003235e0d90748194623 SHA-256: 414ff9cc79d787093ba395a877ba4461c2f4f6178a8686e621423c2700bcaef6
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers and delivering malicious content. The PDF also contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=convert+2+page+pdf+to+1+page+jpg PDF link annotation
    • https://susta.vn/userfiles/file/40295342375.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/mexerumutejigulezixipunaf.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/61191191102.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160785a98c6b84---patekafefexawufijefema.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/dujesila.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/37191269311.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/11031077911.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/36131366214.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/2464401468.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedb464ca7---52016430695.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/b9c528c43a1651582d967a4d1fff8aef/42617567434.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/16080464531.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/nejaduk.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f66478c07---tasitazarojojapef.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/sifuwile.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/adfa2b4973c659f4c33283a5dd07040b/tasitimenenoxulux.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/rifekemoluxarinenisifid.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/lituj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/jftg8i17ufn9vll44cekamsun3/saxikokubodegalobaroguri.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ba87aa412---jodovizidewirofi.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1e3c90e2f4abeefdc669c1967b520d0b/kufirujumesep.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/862a2428bdde9d07bb74fd38a96b2294/43813052908.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ae018e69---83220537983.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2188d5817---noseki.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

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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 16428 bytes
SHA-256: 26b1bf11c7dc470f58d5c6ef70560ddb760a55441f4caee4f88e94e94ed47d85
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 10764 bytes
SHA-256: 2e0b56d089aa0e4b209b315c0d1c2f22c478b8271ab846273111077b00dbe26d

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