Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4b2decd7538cda…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 00:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1470ccc0e8c1866c81c062bf4f295397 SHA-1: 650caacfc9347d16c358991352b22cc86ee0a58e SHA-256: 8e4b2decd7538cda685e5578c5de4c7b602d545a25751ab8ce59e734f1b99cf8
164 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=colonic+health+and+wellness
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d15d0b882b3a7d5f27e1e0a6e2e3c24f/48332607368.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/464b4f8d222aadc9987afbb439619af7/juvifosebuzidemigoguzod.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f5c4667ff75a5c8eac3a5ae4026a500e/62490890355.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086813431270---57009700089.pdf
    • http://debschoen.com/userfiles/file/ladeg.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8a6e4a19---54886691968.pdf
    • http://magnachip.cn/userfiles/file/20210508213632.pdf
    • http://kleinschaden.expert/userfiles/file/3003979096.pdf
    • http://flirdining.com/uploads/files/99818568540.pdf
    • https://yellowstonewildlife.com/fawaf.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3983e7845---kadavunitebot.pdf
    • http://balone.net/_upload/file///vatesabevosevagarivigit.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/766342447d53191f653fddf854c1bff8/21777456036.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d894a1ba23---jarojesiz.pdf
    • http://mackyz7automotive.com/js/upload/files/sodegelo.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f7cd035b---powivedimev.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bad0be78---revisuboruri.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/lukuxujiwu.pdf
    • http://marinapogon.pl/upload/file/diwed.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609090a278371---sobusudevileganoxi.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/64030857718.pdf
    • http://cepsagibyachtfuels.com/images/photos/94496134483.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8fe3699ad---vidokevewinu.pdf
    • https://agrilaui.com/userfiles/file/nukot.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678b6b5afe---18864513759.pdf
    • https://biomedchita.ru/imeg_master/file/31951907646.pdf
    • 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_off0000ec92.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 16792 bytes
font_01_sfnt_off000104a4.bin
c82d9e1c7f1e800e924ba751fd11f8a6308da41d6f76e0c38b2f98f7a7ce8fd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16856 bytes
font_02_sfnt_off00013075.bin
cda43b5348b010767ded457eece5f4fc3c4a66ba036e25bac9b087fa62b334e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 10484 bytes