Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefd0655ea090b68…

MALICIOUS

PDF

83.1 KB Created: 2021-07-05 19:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a78e13edf310d2bb93d21673ed7c5ebd SHA-1: 93561a3026d244a541257bace12b0eda66d7db1e SHA-256: aefd0655ea090b68add0823d5055a038c1b38f4475c02129c49f20b8eef92926
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=strong+bronsted+acid PDF link annotation
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q6uk64gn1kjf4s1v9knpgfn257/69698912441.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/t67v2bgm4fsdc6h6m69uo0e1jr/8771190511.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/39894769790.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7440a35e7---xoxefolu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e595d6adba---96090942527.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/46107113941.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1fca8273cfda58f0cb381bef90ccbafe/30434911454.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/r76i5heumr09lfhq7l513ih9n3/83083584695.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jumurupibovurukofejusogu.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/76106627456.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/bsna8p9b9i5hhsbc2m98gkltjl/takuxomoziwelusugedikor.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a059fedf9e8---59669573667.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ec40b0208d57a455b586ab34ad40d591/fetejamubulavuborudasexu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0453aab6a2501db58c766eba66121400/bevogi.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/fawijipulanorugozejab.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zebakuxotozaw.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdde2a20ee---91081183198.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b80f820bb---48105549273.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/5b8b64fd5ac582d51bbc17e0f388a34a/68683678408.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/67139398883.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/wetifisabamimawasufevo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/qvr8j4htam5ajc78g2quhon4l4/totugudibolas.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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16828 bytes
SHA-256: 7b8af614e26bcfbbc8187b9a219cd14219087a3710325587bc2179f2fa337e76
font_01_sfnt_off00010f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F01 10712 bytes
SHA-256: 2527176c3860fa58196098deb92e22674e42a01b245d66fc0ff11e46a86c2b0d
font_02_sfnt_off00012788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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