Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a6ac626f56fa76…

MALICIOUS

PDF

88.3 KB Created: 2021-07-20 04:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45081fec3c526f9f0bc92390c40239cb SHA-1: 875dba7ea376edcf4ada2c66733d293ee6353610 SHA-256: c7a6ac626f56fa764eadbe145be086b6d9c51d369c2c633f24242aeeb966fdef
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites and other potentially malicious hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/55056fc103d1cbdc84f96605c09a16b9/48918916768.pdf In PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775c5f6497b---48780153100.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/47645590009.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/59793719843.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/sanimobanevugudelububuki.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/rilolukomij.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/kepenak.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081126979d3c---gelefufumegitema.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b40c9b402e29ccb79728b7a3c3f13757/tedefawim.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad1f5eb30---34060096688.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fff8cc060---vajekepegodabaxuno.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/giwezoduxababoputafopupi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7d69e2fb1---wizizudunekejoli.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bacr5fjiuhf2f2s1mk8tsh7agc/72474795005.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5fbdd015c---fejisajenabejuvubokisev.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/67603767136.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160866c43089bd---41049241932.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7cf262d9---gizugisabutiriregum.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4416ad5cc7---tikadu.pdfIn PDF document text
    • https://aneri12.cz/res/file/vilizuvuwipebun.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608900b68f261---74283051584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=god+created+7+days+picturesPDF 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_off0000f72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 16916 bytes
SHA-256: 198a5bc65d0e891d565a85aaf7931d3db3b81a0aa9b66a52c6b9b8b02e8cc286
font_01_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 10660 bytes
SHA-256: 141e13c12fe3892f42f38863854ee945eb3d449ca2768ee1e3d97032b2f902e3
font_02_sfnt_off00013bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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