Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38124ca789988d6…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 13:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48bdb0857827f06dbc4cc790c3be07d8 SHA-1: 13ee40b36a88cc12b65ee0131f97dfb0d248d255 SHA-256: a38124ca789988d6fe61e1ab8b1303c4900db7ad5df2ae9128c6e61c6743767b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or use disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=how+to+change+time+on+android PDF link annotation
    • https://floraplant.gr/FCKeditor/userimages/file/33495275492.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/kuberijuluvixabomuzizik.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/numijuvigewaseguzi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c8f32066---78199088427.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b290c76761---84949311439.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/rogosiwif.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/mudogagivuzuz.pdfIn PDF document text
    • http://metzlerranch.com/userimages/wojux.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/wopexevukumejopow.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/sepexe.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/bavadasuguxisiropefuz.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b916197287---96023133535.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/22406456219.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/9091139760.pdfIn PDF document text
    • https://tch.lu/files/files/taganagivuxovir.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/96425224296.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/34206362905.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/bitiri.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/mipap.pdfIn PDF document text
    • http://deforma.it/userfiles/files/51916230127.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/pagifasi.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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 16720 bytes
SHA-256: 524edd360702e6c6c5108edc9707270f85613f51b28213423159d5f329cff15c
font_01_sfnt_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10680 bytes
SHA-256: 284862805e99b5025d46aa4fb5eddb1882f80ac820c3ab2e6e8aa78d77781fe4
font_02_sfnt_off00011771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1