Malicious PDF — malware analysis report

Static analysis result for SHA-256 2214d364a642318d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 13:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc10704d6ab97725fc696c3729b240cf SHA-1: f123575b716455472e240a026d28f9b7e9c49fab SHA-256: 2214d364a642318d17cb95a98465f9e495fc50d14cd1b5a3274a27617d502732
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are identified as link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=wps+app+download+free PDF link annotation
    • http://giovanninociti.com/userfiles/files/15998057101.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/tst7lnonpr3sigck2pf5fk946q/56948349346.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/boputawisitob.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/5932320278.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210913101339.pdfIn PDF document text
    • http://sdes.in/uploads/58394500263.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/56082433889.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912190827.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/puwulinanedaw.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/79436764184.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/jepepamezurixupud.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/figezojifivotovarasineni.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/nukebo.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pituwuxijojivekidok.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/6273032527.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/17261026294.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/78336389514.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc38c2518---revokukupewetosusuxu.pdfIn PDF document text
    • https://led7.ru/file/tobabokivexumipu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/zijezew.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210901070501.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b232815f3b---dusowil.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/32456569712.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 18320 bytes
SHA-256: bc9562b55cd98d2fe07f823d6fb3d92c677f93d238f4fbb26c2c14b532324e1b
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 10380 bytes
SHA-256: 1e6602b5f56dfb89a2cb43ba60ca5daadefce95e905c09bd8be594f5c105aaf7
font_02_sfnt_off0001250c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1