Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d963299c0aebdd…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 23:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 748ca709451231f77afaa45f0679ae2c SHA-1: 391acc6ab4e3b8adf47661d2c97800e91bf92832 SHA-256: 20d963299c0aebdd93ae6b2146b50c2ff8972d0f22b8f5d260f4b85e2f46dd51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. This suggests the document is designed to redirect users to malicious sites, potentially for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=chart+of+accounts+for+restaurant+pdf PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15e8de08b2---mijepumupodesinivom.pdfIn PDF document text
    • http://domainecomps.com/documents/files/digupeniwalivibura.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/47fe615fa7886f4e7e157291c8dcbb9c/20712520729.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/subuxegizepimuvutiraro.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/pozavofiwawifus.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1d69aab3ffbc2f12f1c2cddf9a4c568/31883513249.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a83837e49e---40180310087.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/sowagelojagiwedu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wavokuwidijeduposixij.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/xovimevajikebowopa.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/voliwirox.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/12a3d7c5cebvkts5esedn5gq1t/73690198120.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/27716154093.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/68133631476.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/tedejazudobixavexag.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/37114267454.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/sidegor.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b55aa7d554f---kijarasonabifejasulojix.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3a6ee4bb2316911d03518cb10ab00b99/semovibone.pdfIn PDF document text
    • http://kfbi.ru/content/file/258399816.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gnictitddtbiknhbnpk50l00er/55292141742.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/40919455682.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/cidjllaaucf3esl7kp8l31i2ia/29613322337.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2007270468.pdfIn PDF document text
    • https://isosklo.cz./uploads/33453080542.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 10712 bytes
SHA-256: 503f00bb605aa7150a9055694b108add101aa8b22b1fc88049358eb770f0c0ec
font_01_sfnt_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 16748 bytes
SHA-256: 5f28009bcfcb90cf4bbf830cc81050b9f50a90a405e802139c9a00098316b9c8
font_02_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1