Malicious PDF — malware analysis report

Static analysis result for SHA-256 251803fa5e670ee9…

MALICIOUS

PDF

88.8 KB Created: 2021-08-03 10:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce6fe09c6b03eac9bf21c07dd8dd1f32 SHA-1: 24a1993381b8c9bac9eefd003c96e942ccbc3f3a SHA-256: 251803fa5e670ee9bbc71cbf480e24f205d43a9b40849f6396f3a7cf61d91f22
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are designed to lure users into clicking them, likely leading to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pixomot.ru/uplcv?utm_term=beginning+html+and+css+pdf+free+download PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2740ac5c---dunidupeferifefitero.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/5414613989.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b849e576---wekuxoxekumesiw.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/buxivap.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a10ab5d5981f5914c7caa2db8ab61ad5/55746798253.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e69e470c957089f70a9d43bd94b518f1/10211323667.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb712447787---16279996887.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/vesinunikafavuwul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080762f9ca7c---popixutisidivunot.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/sixiwojoruduj.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/noweteganimin.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4453ec17fc6a98f37a19221a315d40ff/17443747428.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085e39a7be4e---4093446813.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/fuvukikekokujawedofir.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0d49eede---gobix.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430231416144997.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/kubufokadetexux.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/03d9e515c6abff2c2c15752a77091f5d/6798140292.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/bb3318adaf026a847428a7a412a1e12e/kenutedugoreb.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/23418921577.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/26513433224.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ced9meb78m3ql9unnrmr50m8ja/tofujepigid.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609782fb15efc---dijatexodanuvep.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sf07m8qa8hkquf2n81hgl34een/41981538061.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/diwupabawokukabegudewefa.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://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_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 11208 bytes
SHA-256: 30349ec1e37be3dfc2604fc16bec2a30f1e00d35a9067750cd02c505c9d473e1
font_02_sfnt_off00012b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 17076 bytes
SHA-256: 9fc4eac2d02a3a25a7d828216606e4dbaba99d01972e9c5933dbb23d04e5d4f0