Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fac411d99f01972…

MALICIOUS

PDF

104.1 KB Created: 2021-09-02 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 239d5dd997469b5c28e49e00fb9ed78f SHA-1: a4edc55cf62419e9413f865b9bb89c3de249771f SHA-256: 3fac411d99f0197239327c54ff768d8e12b2d92526ef9ccfc9857aa526b72750
104 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest an attempt to lure users to malicious content, likely as a first stage in a broader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.sanjuktabanerjee.com/fckimages/file/mugumupir.pdf In PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/nofalumovodibodovaz.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/vemadejexufifenarapari.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/79085168910.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/repubabeva.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/dofadidimabepuguwizeroj.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/narezi.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/737dc6dembd88b6hfnhlvafiv9r33bjc/60828201512.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/lovefekizovixoduzatapu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kt241839oap665k5jc7h2i5k8e/9670077743.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/malurixasedijesiruriro.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/89913699678.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/tusakinefevamakali.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d345acb8---74875874468.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/pupuxovox.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f6d1fe03---45162865978.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c58dd66710f---dobilurikovapibipa.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/66152030381.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rhevot28tot2jiiar6go0v6thh/37213573486.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/82407040216.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/50500679937.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607288532d824---75080837678.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/07a47edaa99b51cfa88a3b508709d338/59754334196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=feb+current+affairs+pdf+bankers+addaPDF 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_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 18576 bytes
SHA-256: a24296b26a4830a94ec352af2150cbecc1716283f2ead123699b44d0f7c2675c
font_01_sfnt_off000161b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161B9 10756 bytes
SHA-256: 90ef94681e20a3e76019faa3737b36eb2c8397fbb457b2c7f29810656dfd4c8c
font_02_sfnt_off00017a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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