Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4767c4c414f709…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 14:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d177fcc7e156db993434e88f7ff2ff65 SHA-1: 028b0099e7078c07f278836a6f3c307a90c14f51 SHA-256: 3b4767c4c414f7093aec99f96bdf9da9b4f11e70ec69bea393594dd548fccb42
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various websites. Several heuristics indicate that these links are part of a link farm, potentially hosted on compromised CMS uploads, and are designed to manipulate search engine results or lead users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://fresh-j.info/images/uploadedimages/file/97886356547.pdf In PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/kivigusepu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5557487c---fogezifuniseg.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c4546e4f14ba3bfd2e60c112519513fc/13516174365.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4e9bec7a---54355301800.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5afd1852fc90aa6dba71e01e3cc6d7fb/zodoxikefirek.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/mofogunadameta.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e648c9b9---jepitorosomapajotiwe.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/mororitakiboz.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/kovawinixujo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160944468aa935---zezadurirelaj.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/tiwowi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023a8085ba---demedevexage.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vexirek.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bazuguwojof.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/597ef0cbbbe5af40c8880b5be25f9d7f/womazazilemutifuke.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/8a5ece9bfad376281e73b2a7d0569147/gekoribawobavo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e617fe5e50d---pizodetad.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/zakajulekak.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/fedb6cc51253d1378fdfd213496346c4.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/74q7sfn3km7h424n510afp6cn4/82483581683.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/75127005905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=volvo+v60+price+list+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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 10672 bytes
SHA-256: 4edb5051ecf333170f8394d9e0764ced661d3c470d2c228bf14dcf583517bfa0
font_02_sfnt_off00011266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11266 16964 bytes
SHA-256: 138caed0b5f3e3b0577dcfab2dce38fe085cf04a9d616cbdc62885b490f1138d

Open this report in the interactive analyzer, or submit your own file for analysis.