Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de0f9a1434d45ea…

MALICIOUS

PDF

85.2 KB Created: 2021-09-12 20:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9b1986498642cfbdc798bb791cf3ce9 SHA-1: cb8e8ff2e713487efbae27fc0272a89e994a0c79 SHA-256: 2de0f9a1434d45eadfd0fdb24c1a87b5e31af67ffe0f61ba0cc6de1fcdb7ea41
104 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 sites or disposable hosting, indicating a link farm designed to direct traffic. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on potentially compromised infrastructure. The document body is heavily obfuscated and unreadable, but the presence of external links and the ML score suggest a malicious intent, likely to lead users to malicious websites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 http://labonscafe.com/userfiles/34362693200.pdf In PDF document text
    • https://resulgame.com/calisma2/files/uploads/dekorigizojajarexog.pdfIn PDF document text
    • http://ux-school.ru/files/files/22498509515.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/59062731623.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/busodo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/82817128720.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/wizixogenosapif.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5148095a3---nexidufatemixile.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/88065155145.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/677c7ddc053a4e446b5577876bc2e220/kujakebe.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/momumomidifek.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/28854154196.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/90556990685.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/84495519517.pdfIn PDF document text
    • http://stattus.com/assets/file/dikagetikajudel.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109021918141027.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/wonizetulenifobitunuwira.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/46483996206.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/giwasi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f3d6e0932e4b140ff34ab6a18b6487b4/vobewupofazute.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/42976804500.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/wiwobamevebinugig.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fipopa.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/zawelikoz.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137463e8534d---21228437878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=8+ball+pool+lucky+shot+hackPDF 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_off0000e346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5D 10600 bytes
SHA-256: 476fdd70dbdf8c49026aa62a8c0cfd5d5b7d16bb97422c61973cc139d4dcada0
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 20340 bytes
SHA-256: 068a9c5dd5cce43648453ad686fc714cc7a78093225810d28e3d3379d77b363e

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