Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27d814fe11f985f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-07 06:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b80fff1ac8ede3160f6ec54d9801eac SHA-1: b8a3b3366de3e87d6b5f3a83b0d5aeea8a3f2b99 SHA-256: e27d814fe11f985f46c52a87ea94f9551d6c001de28fb450b2fbb06980a92743
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a probable attempt to distribute malware or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=technical+english+2+pdf+vtu PDF link annotation
    • https://khotelmarket.com/FileData/ckfinder/files/20210830_0ACA6CBDC72F5879.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/47171370538.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607471af977ec---51622868538.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907050745.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mifezexozalegiz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p931962gtciik7d50m2a6ca8m2/23872105924.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086ebeb1b0e5---27332091502.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/77521654255.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5f17a07ef---nitumorobedujopijin.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/moejgqpen4vqatb9pi8e2o37b2/vasunokawowibir.pdfIn PDF document text
    • https://mavibusiness.it/file/notelerapuzakenolesuvabe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/gosawaxiwinosa.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/23131540935.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b95273e19c8---goruxigakibinax.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/95584987308.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/462d5dda740d77970bf47d1ef9a47577/pezedutenokubaxizetatop.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/43996643467.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/93ff49f1abfe46fe8c11787a2f32076d/33062869694.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/duwimarapofivivi.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/mixegagufimexibadad.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b87253c20---panomuzejavovizapi.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kaxisujifonexepopufanek.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/rokazofevaleketimapari.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/34794744004.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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 19976 bytes
SHA-256: cd43d2123261a081544dfc1e5644c5d681f1a824ca607dad2fab82174514c959
font_01_sfnt_off000124a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A0 10928 bytes
SHA-256: de0baca94863baf5c5ea3c737419a6d15f902e8f9e85494dc84f6fe852f4d35c
font_02_sfnt_off00013dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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