Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa70d89436485a1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be0f83fa8ec0ff5f8d397cc2ae73bcc8 SHA-1: 38be8e10167ab049ca7014491ea4f559f65db33d SHA-256: 2fa70d89436485a1c320c130a81c1c3086c146a51496b2c6303ec33b5b9070e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://coretry.ru/uplcv?utm_term=fall+guys+ultimate+android
    • http://baaningdoi.com/file_media/file_image/file/wopogorolatu.pdf
    • http://franceplus.fr/userfiles/file/nadedadat.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/zodimevarebazerukekujugo.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84709fc4b---gipikidanisonezuwadizajow.pdf
    • http://lamelove-zakryti.cz/userfiles/file/bodikunijijozuxekedubawu.pdf
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/69872086251.pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/43340931569.pdf
    • http://longruiglass.com/ckfinder/userfiles/files/20210913_073756.pdf
    • http://thietbiotoviet.com/Images_upload/files/91688328825.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mrhle2q2jiacvhfgp4rcklojb6/28137455858.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036f749f70---53015541760.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/kezas.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8899ea6---70952933677.pdf
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/70293659551.pdf
    • https://abriganature.centralcms.cloud/galeria/files/40397667912.pdf
    • https://supermagnum-bg.com/ckfinder/userfiles/files/85171922601.pdf
    • http://rajhansnursery.com/userfiles/file/kamuzokakugimasa.pdf
    • http://dae-young.kr/upload/fckeditor/file/20099731164.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139de1451e77---gigizon.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fb42b93c8a959d39fce07090fae51a1d/20873757566.pdf
    • http://tubesealer.com/uploaded/file/8132563656133b8eea295a.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_off0000dd9e.bin
cf8c93a525c9d4f9bb8a123775eb06098a1f7c045b0adcc7a6e98b5d6c3cf4c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 18012 bytes
font_01_sfnt_off00010c63.bin
fc37c024cc6d1bd256e4bbcd34f28c307c5f210c6375af1948bed4c3a4e85e50
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 10780 bytes
font_02_sfnt_off00012500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16792 bytes