Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0487c88b9211f12…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 05:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a759a5cb26173ff08c186199659a98d SHA-1: 7d2d5fe9ce3593516254b8ee456987377f17fbe2 SHA-256: b0487c88b9211f126ea037fe4b72c8f33d2743d51dd51e07bea257bba093e64a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ae357a60---56748018557.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ii5ilennjrlqdhln8jplqe7r2/tekudobo.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/nujebulasemo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/9aa6baa82f9d6bf140891409a54904a2/vivewagajuwikuw.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/gerilanaruxeminekoleribu.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/kedululokerozozika.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160978e878804d---81201673451.pdfIn PDF document text
    • http://briztravel.com/upload/files/47199071646.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d522e2d03c5c972e8ae8ded45c0d2497/73369882634.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xavevetapukedit.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/71165806553.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qrr280u3k7t0686diiii64ck0h/fobinuril.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34472493702.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/936aae3cfa60b467bff7bcffd91b7977/pesowez.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16128fb41b96ac---lujezadek.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161174f2044bea---fefigelonitowenovag.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/5749702444.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082494f98c18---pimovukajonod.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/75830338316.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/5200891119.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/bowokoxujarufi.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/sixivexenigosevolivepe.pdfIn PDF document text
    • http://www.heksan.com.pl/file/6442657268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=in+the+middle+of+a+sentencePDF link annotation
    • 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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10592 bytes
SHA-256: 2768c81d5ea2c53730d7796a0d24b48ffcec3e72c913f77c7805699a6bbe9d9a
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 17520 bytes
SHA-256: 5f9982e21e6f1e3087fd37b7596ef1595479859fa97352700a7435ece282ee45