Malicious PDF — malware analysis report

Static analysis result for SHA-256 938dd39d8f1f4185…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 07:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ef3162c97631fe880835f4829977fdfc SHA-1: c0a360d2cf8d6576b6cf8a3bc9f3857aefb0f3f0 SHA-256: 938dd39d8f1f4185ae1ac4c5977a5d0556e9fb28f5aae9efb34a55d89cd73603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and links suggests an effort to obscure the true malicious destination or to distribute payloads widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55a9882d1---84826414792.pdf In PDF document text
    • https://warungmimpishio.com/contents//files/kemetod.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/19a9bf66ccc419d478b90f071ddb7c09/ruvopofezulavegexoni.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/46221205836.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/funiwanimerupofuxejude.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kumekijenowisewaxafajoz.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/30279608740.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/19829697418.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e1a5dbb14fcd3c6614024e3193e78056/62227483105.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b73064a17---95225555037.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1417b156af383070de23d6f6c3df0574/93033753565.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/00b486d56baf53d0406b89f3b7315302/661123144.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///23322985562.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb5ebc7a2---dokoripimesezuzinut.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/51e83fac642695bc7dfb73aebab3d6c8/meponaxujutobexoxiz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c77cba48d---sulevajovavob.pdfIn PDF document text
    • http://sakem.org/userfiles/files/nojiwevexata.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/31/damegifiwula.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a50232aa7f---mutofade.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/devudewawokatikebobekejul.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb62d6f93---lodokuniwivuxixiwarevopu.pdfIn PDF document text
    • http://qdjshg.com/files/file/83499717006.pdfIn PDF document text
    • https://paperland.bg/uploads/file/bixawovozagugavero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tamil+sinhala+dictionary+pdf+downloadPDF 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_off0000ceb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 10916 bytes
SHA-256: 1cf3075cb0c3bb213fe8b19753abb7e36c52fec940156403418bc1439cfe4bca
font_02_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 17664 bytes
SHA-256: 2b93c607a76628c40e6444daf720262ffe43f9b0db94879214e8c199cbe8011b

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