Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49a5e81ffbb9eb7…

MALICIOUS

PDF

71.1 KB Created: 2021-06-13 13:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: abd9af601d2710fba7356ed0e8e2ca68 SHA-1: c8516a423478541f62bd2d6670fed01e1e2e12f8 SHA-256: a49a5e81ffbb9eb72a8dd0a15864bb646fd0a9519f6d351444a91422f156b678
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress upload directories and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded content, though heavily obfuscated, likely serves to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=words+to+feliz+navidad+in+english PDF link annotation
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce56842e4b---nupazozamexo.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160895fb43b4b7---mipazaduberirugusoros.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082daaec74e6---gafumi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/tinavi.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/gitunukabexevanefawupeg.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b89bdb1470---kaburijuguwelatu.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/fulinuxagifomovasunex.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/aukpugfepdu9r5aja3ilu0r6qv/xelesijoje.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fc356534f---73602904354.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e25138c87---vigewerilubuxutuvidu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/00vsqssv0r1lpr5bd32riji431/dulatuzamegokekezip.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/lozozonurowubodakuz.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/24585618066.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/bhhu9d4n753d9k0vd71auersi0/wileriruzolekuseluxo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d93475b37---jijasavemipikewenoronixo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a6ed22ed0---bosedosonuzazel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD675 5292 bytes
SHA-256: 055cbd81624829511b3d685a2cbf25d296b7112ae6deef6a445aea19238a8850
font_01_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 11940 bytes
SHA-256: e05bc2b7aae68f6db6efeb6198bfbafe3ad7bf6f9ef600bbfdf03223678377d1