Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b9ad3c762fda10…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 06:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a70b3de0ef8b2b229d88fd2556b81e2d SHA-1: 4575cf3a9e00cd13517e19c66aec3573a5543e1d SHA-256: a1b9ad3c762fda109c708ff8c59711f96e39dbf6e41742e350029cb41e7110c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised WordPress upload directories or disposable hosting. This suggests the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=college+papa+video+song
    • https://spacio.hk/attachment/file/filekiv.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f3c1ba0c271ea0edc2763697646ee25/nirazupeselig.pdf
    • http://capmar.eu/userfiles/file/8291758380.pdf
    • http://banghetretruc.com/media/ftp/file/lufova.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/324c37814cf1579ef8501c31992fd0fc/73829586239.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607471cb67f20---40922046917.pdf
    • https://viboot.com/ckfinder/userfiles/files/96863584842.pdf
    • http://thaide.org/userfiles/file/51628328027.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/9085201859.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/33804173878.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b25342f9d1c1b9af9e1997e0d0041179/sijezelokilojesiw.pdf
    • http://weifong.tw/fckimages/file/33867061937.pdf
    • http://akinmedical.com/uploads/file/69475065132.pdf
    • http://cafehinglung.com/uploads/files/7519839615.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/23828398146.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/59203531051.pdf
    • http://afghansolar.com/userfiles/file/garakevegeresorokuzurosid.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a354072a---rajejefade.pdf
    • http://davidhammerstein.org/userfiles/file/vogiz.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/buzolij.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/t7kadf9pv9qe9rnff38m7aajhk/mojazuzamubusepal.pdf
    • http://dui-antidote.com/images/userfiles/file/teborabur.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e2ec59bea---95960354981.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a8f7c364b---87679644802.pdf
    • http://aqbnb.com/uploadfile/file/70195064096.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04e.bin
ea5ee6dd5aefe3506379d60576c7e3db9c884978995a54845ca138b51f17d4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10468 bytes
font_01_sfnt_off00010804.bin
78111d5a96b27f483f6f5712e95236726e6784b73b63e8df359d4f9a8f05039e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 17664 bytes
font_02_sfnt_off000135f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135F8 16792 bytes