Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecda1aef3688023…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 00:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8edaa0bfbe60e3679144ff5a5ed75bbb SHA-1: 39b8729edf1aefc4a199f30f8b9317b70ca48fa4 SHA-256: 5ecda1aef3688023b6b98af796335073bdf52f4885b68a7f2c0db1748403aa47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://manilag.com/FileData/ckfinder/files/20210716_D52762EE90B26EF6.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ddf03a080b239cf1d75081ab066f1634/nimatevanadononevomet.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/23825891221.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0de4d130f1abdb73385119640ffa6278/fixutetezaxemonuxugeg.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3d054029---mumasoguvifabokejetof.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/206c3ffa12bf9b61775278bdfb8e9df6/33787037877.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/71691174984dd6e8e2620671aea37005/puxomudakogij.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/44c6a7beeec11b1e9de5866800dd0784/limojegunimupeve.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c44d9562677de7f3443e46ab2c4eca2e/nurilefitajo.pdf
    • http://www.siposferenc.hu/html/30209711450.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lslqbg9d32c595a1mktf1cp8en/nefozajibot.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798c4ca472b---71117642990.pdf
    • http://gildiamasterov.ru/userfiles/file/55359796819.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee88216d3---66800783976.pdf
    • http://andrelandberg.com/userfiles/file/35246050749.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a21c01c61---dawazokojexekobedezametid.pdf
    • http://ankaser.com/userfiles/file/rafutigugadilugefov.pdf
    • http://majortaylorride.info/images/uploaded/file/2640223361.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7rjh0nrtepfavobrmkbm8ufm63/tewejakepixibeduko.pdf
    • http://n-production.com/upload/fckeditor/file/latodekad.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/nosesibufarokafusazora.pdf
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/fuvebifokodabavogaxexudew.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/i9v8js4u7mpjd5kge3hn7aunug/77262366794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=high+functioning+autism+diagnosis
    • 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_off0000e8ef.bin
643f453d53f5179d38bd1178f095b597be0b7842296cb02a3a5d22510249c3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 16876 bytes
font_01_sfnt_off000114bb.bin
7aceba6f9c4e8e33a54cef595b923dc671ab619b9992940d019055b3f9f29d8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x114BB 10736 bytes
font_02_sfnt_off00012d00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16792 bytes