Malicious PDF — malware analysis report

Static analysis result for SHA-256 5882caf5de167a97…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 17:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 203fd1a465a17512b66ddc427d2d4e13 SHA-1: 38100cfc22c528d0b471bce3e18b4fca5800651e SHA-256: 5882caf5de167a97d282aa8586a77d0c9fc0a448ce1beafc1e33fa6235a2b338
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, often using UTM parameters, which is a common tactic for SEO poisoning or phishing campaigns. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://georeno.ca/userfiles/files/56951968671.pdf In PDF document text
    • http://secureyun.cn/uploadfile/file///2021081219594273.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/h5deu7u526epg5sbeofshmgel5/49102182704.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/jebiluxiruro.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300bc8f4047---4400753462.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/55853547644.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gcpitaen9b0dcfris2vp9kljf2/rusanasijolegosurap.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xudasodevaz.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/jenud.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9b1aadaf961fd4420b7f595b21592425/xabusunanar.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/18659852651.pdfIn PDF document text
    • https://coluer.ir/documents/file/95474732732.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/54821429421.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///86040416123.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/52196910960.pdfIn PDF document text
    • http://gardatrans.com/content/Files/jigojem.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/karuren.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/viragusosipug.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/35989108255.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/43350661223.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e6f853e7b1---94174892817.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d704a2b51b---80253292426.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/tokopumebusavojozij.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/8704096719.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a37382a8363---kajeraji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=grey+water+treatment+plant+design+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_off0000d69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69B 10960 bytes
SHA-256: ff2cfb34793b155645214a06a6607f72bc10dd8d5770a871958e02674bde7077
font_01_sfnt_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 19880 bytes
SHA-256: 816e0e0c1c36a14a8e8b324f93e2d94e0149b53ac7755e250dc0dde8f6e64109
font_02_sfnt_off00012232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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