Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87a3286ea923f72…

MALICIOUS

PDF

87.7 KB Created: 2021-07-06 18:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8a8f946c8d36b8d05dca5f7868c04b6 SHA-1: 2acc4d564d3b8c843270effec05ff6641fb51797 SHA-256: b87a3286ea923f727ad245a8cc531c3b7bc01d928b5e9ad9def3c388ccebbbfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing pages. No scripts were extracted, but the structure suggests a link farm designed to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://huntic.ru/uplcv?utm_term=conversion+of+a1c+to+blood+glucose PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609102a2a622e---48592213635.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/1278618511.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/jofarasofigimagipolumibe.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/26097825967.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/algij1q7kghgt8ceeo67c1u7d6/82707559569.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/215681ad6abc3bc6970e590afeb9b4e9/xosefoxerudirenisumugek.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/91027646979.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/a87bamospvg0fbo3ljuo0agrr0/govokonafanolijedos.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16077d098223c8---bavetiba.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/vudijiv.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083344f7a01c---tabitalopawowisakow.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/85cbf87f2c7f0d264c21bde433446cc3/gamusukir.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/zodijotivagor.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f89bb2803859a5227ceb40bce4c845d3/nazozatofitapo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb52e8283e---xezexefigedetasisa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085afc0c6aaf---86556285165.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/202033241601.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1bf64819775b1528d7618a5702f02529/59732654019.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/sebuz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9793f04426f064ce4f007b82fe805941/70382416590.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6f392764---13664297189.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_off0000efce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCE 17980 bytes
SHA-256: a25beedf1071a343cb6c00fb2e9c848953a4765b155d9ddea94a31f39005b267
font_01_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 11040 bytes
SHA-256: 58c31ddd2a9d52c9a17f494496dcba060fee694f1a968ecd10e68bd707d57196
font_02_sfnt_off00013826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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