Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a902faaa410269…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 07:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b909b58847bd63c9a4d4b598f7abe863 SHA-1: 61bf70cd7832f715eca3271048fd49e2860e289b SHA-256: d1a902faaa4102698c39a29e2b91e75e115e91f0b4ff051a636d5ba01fd749b5
164 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 WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button lure further supports this, although no specific script execution was detected.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=how+to+unlock+bootloader+of+xiaomi PDF link annotation
    • https://satellietgroep.nl/userfiles/files/sidisibinaregiteme.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/5932009099.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c0ba7e8b89c3181bb0f7d4112ddf0a95/vodamumebukatesisu.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210911132328.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/92842547251.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/palejijuwosatiraje.pdfIn PDF document text
    • http://katela.net/userData/board/file/61946773507.pdfIn PDF document text
    • http://showdoimovel.com/files/files/72823163151.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/14453237604.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/49005700937.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/sugekezet.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/66916570986.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/99111269846.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5a0e6862---nudasukafenaladisisulu.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/pokipotamofagewogodixun.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/72257250713.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/napisodogizenakufolep.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/9715160335.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/wekalotozijamom.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/15732840142.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/nuxujifilodexokoxe.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e45679dbc---98670010517.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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 17724 bytes
SHA-256: e490c7dd7f2f32cc3caf300ea6966d98d7c4ea2b1b05571f652c7d23df47ca08
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CE 10980 bytes
SHA-256: 9a3d01cb60c6ccd84e34b73689970aaf9ac11a3a7284ff11f2b7cfc143709d43