Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcd0fb356e7c266…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 07:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2253aecb50b540f2ff1bc527b58bcbd2 SHA-1: 3be46ef15f8fae81e2e3858c8ba0f4a2ddb10b17 SHA-256: fbcd0fb356e7c26619459b4fcd5ad500404cef4cad8c9b0cbe24ae56fe908745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f37ejlmimehjt1l3t6dl3pco8e/paxadejomuxiz.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f6f01c602ee4e2e8e0141b6b7e2a717d/69362035000.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b296236c1fb---kujotepez.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/91b521766daeed8ae95fa6296e843979/4280556243.pdf
    • https://avenue102.com/uploads/file/87048710876.pdf
    • https://skinrepublic.vn/webroot/img/files/ginedewovivuwaveta.pdf
    • http://marcobernini.it/userfiles/files/8513234241.pdf
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/27170710075.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070479678270---92568917084.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2750aa5e0---9380667627.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1de6e10361aa1a3ea3ddc257a22deab0/70493308131.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da4e9791e36---11449750474.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9137e53e38---60667094717.pdf
    • https://contactfm.be/userfiles/files/7046184323.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42d243874---kevirumozejigu.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/053d7bf7eccbe7b68c8b523f3e8427a1/wigagezazozadogapunutabuv.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7c94373f4---ladoberorututime.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d99d3ac65f---jadeladifubilaveli.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8844cd89b2---navimisutisidakaxefojinon.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1e24ea9c---53577981657.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb98e6d44d---48972902092.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd2e642f64---40864261775.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/79459705560.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///65690037942.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bishop+middle+ages
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 16792 bytes
font_01_sfnt_off000108d0.bin
948b528cbc6ec9150eb657e9aa1a57c83bc99eed0ad53720311c8ab97d553408
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 10592 bytes
font_02_sfnt_off000120be.bin
9d769b402df0aad5af11a455ae1494283ac0acae4bf96cfc232a4bdea713b260
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 17264 bytes