Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbc8ac8a0da6297…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 10:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f86aa10c5d27e428c6e39e9e56847cb SHA-1: afca50ca2eaab79e1b00fcc2d41d3e01a4406bb2 SHA-256: ecbc8ac8a0da629734d9dd374e79c9ff75e6db28883ab38b02c7f0ef6154b8a9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=rain+bird+wifi+controller+manual PDF link annotation
    • https://mmagame.com/userfiles/file/10231619066.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/87385261781.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/047569d409fa24c84b81f68ea3c535e0/46589946005.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/f0b223b70628714edf857bda3a97e980/tefaxib.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/4139854292.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b058cab4793---17262982216.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/towesixunen.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/966d276acd57634e5031ddf0d172eb9b/71787763831.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m7mmb3hmtkh5di87p3gn91vbuu/95924782449.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/pimvj1puutab7v5d5s9udp2u01/fulanojuzigizekeradonuze.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lavele.pdfIn PDF document text
    • https://anup.bo/images/files/voxanu.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/30399570689.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5f6c9a480490447949caa3826ada5870/tifikofupadopobopuzumiwaf.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a236bca3bd---kivid.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/72219196253.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b0b46598008a527aaa0004a44fde52ef/23018991144.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31a822501---90256736867.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb5f9d904---11833819831.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417b65f8e5---67372140430.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/15326838372.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/1645744336.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_off0000bffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFC 17952 bytes
SHA-256: b97336cfdc8119dbe79cd2f17957c1c33e7b78946c884e35c8cb7901f85a568e
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10840 bytes
SHA-256: 540d2da482372b8cd46b6420bcbc589f13a92d53ee30b5dd8548cf5b29105e2a
font_02_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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