Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ac7ce77cc93a5…

MALICIOUS

PDF

85.1 KB Created: 2021-07-03 06:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e0b2f61b5448ff2635d886b20ad54b6 SHA-1: a4afc958463168b172214e8515b1dee1d0eb3f53 SHA-256: e35ac7ce77cc93a5f4386ccbae6a50413d0477159196f89f8afc00fff98dea9a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into downloading a password-protected archive, likely to bypass security scanning. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=read+wuthering+heights+online+pdf PDF link annotation
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085cca823674---10662944727.pdfIn PDF document text
    • http://roocenter.ru/upload/file/vasagene.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/a87cc95c97f7ca53c52a4e42f29cfc69/kikatiwoniwozukolek.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/fijog.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/59cb938fb40c2c31f9e7483b6a6f2fa2.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089515e7fcbc---niwepadizukulow.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac861d32f72---jokonaxubupoxon.pdfIn PDF document text
    • https://susta.vn/userfiles/file/soxutalevogunasimexuk.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/rixegope.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/22596d8e0a5a428c51f789c2fb1f09c3/2249001597.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/abc8ef580mgat5ab91s9v3ti45/765111294.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ravusubizu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/fesuletiriso.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/68365237599.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e7b3732a---17554707816.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898f665d7a8---vobamomusujawajibaw.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608def37b1ae0---taroxegarubenumogivib.pdfIn PDF document text
    • http://allycatering.com/userfiles/bozixaburofewama.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/xiwutalewudimagowul.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f6ac91476---39838833797.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5fa7156d86ec120fbb97e3c02d58b329/10165634249.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_off0000e86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 11008 bytes
SHA-256: c6fa7c2a889ebaf816b554e2e81586d7bd04869b143e2f72add5bb08738089b8
font_01_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 17568 bytes
SHA-256: 06c0594a6ca8828a0d80fc990d840b2f4f9bc882f732cc34c7021163d5e4e274

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