Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cd1b4ce787eee8…

MALICIOUS

PDF

127.3 KB Created: 2021-09-02 11:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdd0a07a69bd37c231c4c068978ce2aa SHA-1: e083c993463b1dd1f3f63e0a20c60c708fd0f7b4 SHA-256: d4cd1b4ce787eee819346dcb0f4b20d711e1b53e7e70ced7424e4d55a1f74b25
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=teoria+da+contabilidade+sergio+iudicibus+pdf+download PDF link annotation
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwemawugowetif.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/23575984991.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/dodunokes.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078572c7af02---98408790514.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5b387189---xetogeliwiwisodoma.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/46782449975.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/kidupofezoguposipademe.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b927ea62---96749584274.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/57322622557.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/c16bb8b57a3fa067abdaa3c5a4a42018/zaxufumazaxuzak.pdfIn PDF document text
    • http://konberdbio.com/upload/files/ritapun.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/naporagavavapafin.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116ebd5ea1ec---58316084138.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/nemefavesisifi.pdfIn PDF document text
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/5190808238.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3efead5c5---lazinab.pdfIn PDF document text
    • http://www.heksan.com.pl/file/mogizoxapurunitigesejuves.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/tamudelumof.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/punonodowetojufuzojefizox.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/ck5a3nnimltcl826iuiuvdlc9v/wujixasekude.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/36186530461.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/kogubulivezuxojugezapa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6e5280013828c5ad5d92c2290f069e1a/pomigaji.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b8c9fcd78671b8e1482d39156715f8cd/96116530117.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8689ce67---bujupit.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_off0001866d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1866D 21404 bytes
SHA-256: ad2411147557eeb028151fba47093558ea92a3f2f51a5a4eda3448b5f121551e
font_01_sfnt_off0001bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D591 11084 bytes
SHA-256: 6cda1c60dfb6c53562a593af409730d4d6f710388240b7f7f092c8e77ba30a41

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