Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1239dc6ac523f38…

MALICIOUS

PDF

87.7 KB Created: 2021-09-02 08:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69bfcbb8c0943615711b090ae9912f62 SHA-1: 2eb8dd6d469b88da5b8a5a66ee341821a5c0f1b1 SHA-256: d1239dc6ac523f38a0f08fcf08740859b5603b1464052e243122f3c97c279d39
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and other domains, likely intended to lure users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories supports this. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/bo0h6pdltmeqil53oqmr34s9b1/lifexog.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/sakudiripalutitudaj.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/64491173467.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e848eb84f---805266938.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/84867624455.pdfIn PDF document text
    • http://cambodiadriverservice.com/userfiles/file/paguberuwemukafafopop.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/jisejelipewusupefukilun.pdfIn PDF document text
    • http://bertolinacare.it/file/11985506253.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9904a1ba7e---47953400752.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/2281b2b3c8fe05dc82d4f8bfd889de9e/82964526106.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/54896908958.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108061052032228.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/77783240290.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///73810528901.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160841d9f1ff0d---21656314948.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/53305207921.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/zejovijotegixuvona.pdfIn PDF document text
    • http://dytac.hk/userfiles/4719805216.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553b2ada68---lifurofonajonux.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f435295e7---bijofa.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/sojukemin.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/67524167761.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160f07ea4bab05---lediniwu.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/mifawu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6efb88e4---16316848161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+google+books+to+pdfPDF 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_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 18288 bytes
SHA-256: 854d6f53812dc572337ef8a03b8abb97dbd14868d4dcb6bbdb0ce9e45864ae67
font_01_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 10800 bytes
SHA-256: 5c92b5ebcffdaadbc47130eb5575787c9b19a9fddfbb6423e142ec1dccdac540

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