Malicious PDF — malware analysis report

Static analysis result for SHA-256 793609eed970d4ae…

MALICIOUS

PDF

84.3 KB Created: 2021-08-25 09:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c8a0273f3624efef1940f9927879f57 SHA-1: 2cbb05b03bfbea03ff59f86f57e2da016757b9dd SHA-256: 793609eed970d4ae27400f7ab5ec6ecdea3ec2d16c121cde052114d252121e89
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics indicates a clear intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fnvu8ojif0qpv9g50q50k78in3/42115950253.pdf In PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7c401804864581586bca1dad5798fd75/80389472156.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccccbb298aa---97396909257.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/dalesesimovoza.pdfIn PDF document text
    • http://pinxedien.net/upload/files/76108491504.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8decc9e8e---47106035181.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210822_DB85328BD3E520FA.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/724786a8e2e8394886ac7438628b7a0b/87532844732.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/timozezirezebitaliwut.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/nkteng3fah5214q7rcgik75s8k/93028777276.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/delolukalux.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210531_115505.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ab0616642---69106784464.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/54219538773.pdfIn PDF document text
    • http://sam-global.info/files/file/viliz.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b3cc2c3a---51687466002.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/volujojurunurod.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2e860232---81886422198.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/26459975893.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/23631889726.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/74699389989.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d3b1989fb---jolife.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/tegodakoledixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=national+geographic+magazine+download+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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 17780 bytes
SHA-256: aad11311f77dd286891671b0a540716861b8a32a175a029cfd48cea2b386b97d
font_02_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 11024 bytes
SHA-256: 9f9f04bdf85d30016d1d8839fe917cd3278226777c362665e08acf730b93d1ea

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