Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e8d4738d027cac…

MALICIOUS

PDF

72.1 KB Created: 2021-09-19 13:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69372f36021961271a5a39b52d7372d6 SHA-1: 45845d96ee1de2f57790a775e502f841391e8083 SHA-256: 57e8d4738d027cac0fef45f1a1dd4766ad889834a7b94c220df0dff6047a05b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://inwebjor.ru/uplcv?utm_term=slam+dunk+dena+apk', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://inwebjor.ru/uplcv?utm_term=slam+dunk+dena+apk PDF link annotation
    • https://daqing-jewelry.com/uploads/files/202109161159513861.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/85419377038.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/87161189564.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/wefivujikidozev.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/97695576780.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/pemujubaduguwomazorazu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/bazexisajujikusap.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xuzozibatukeduzuzuri.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/42680164987.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l5lcqgljki300og5k53dkmi2uu/jumibifikenajovekizagove.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/49461312473.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/velogirelami.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909162408.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/74189248779.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a4240be3---76410794483.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wubovovowonuludo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131705108bc3---12912800869.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/9d7c5487787308e1cd9d681006b9e8af/62004484308.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/53788443010.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/98750570260.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/41059648924.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/71543085251.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/bopufezidofirikev.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/rijepametu.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_off0000b82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD041 10244 bytes
SHA-256: c99aea805dd85fde26517a1860456b009d274887b3d3696823d20626fd88e8b9
font_02_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16892 bytes
SHA-256: 301e385e07708a79658502abf1fb13721b6d44a8e175c799e8ab02504d28ddb1

Open this report in the interactive analyzer, or submit your own file for analysis.