Malicious PDF — malware analysis report

Static analysis result for SHA-256 57482276ec3f6c7d…

MALICIOUS

PDF

87.1 KB Created: 2021-08-26 05:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ede848d8a643d6e3d4f0a7d0a02f2e17 SHA-1: dde3646d67ece5c40a784188c292f47c86353edb SHA-256: 57482276ec3f6c7d19a1057c434e70bbc520694c483eb7ea6590be9f4feb3873
164 Risk Score

Malware Insights

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

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 to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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=county+court+judgments PDF link annotation
    • https://akproauto.com/nbloom/fckuploads/file/dizatirubap.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zudusurufu.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jatevuwevirelope.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/funoterexojami.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183b5a9de5a---bivonafopojixibagivode.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/89825886201.pdfIn PDF document text
    • http://kag.fr/userfiles/file/72548396393.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9tuoetts2070vo5e5s066pegic/38608114289.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/32710848274.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/varuxebezufarepur.pdfIn PDF document text
    • https://lecachet.fr/docs/files/86362037941.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a3053ffa9b673a917336537a8787284d/35254685537.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/xixesineli.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/bb88d2d99360e609954fb79f6e84be24/kasufuxuvamanan.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf543cb1f---kaxegubuwe.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/44207334699.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/15619915490.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/mozubedafe.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/gefajovo.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/8087856069.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612069ff8d502---matabitatawuniwovuwa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74082243655.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/vekazuvedip.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/dfd969f9a024e15a1726b7c7d3851988/dewelulox.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/papezovageba.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0037f9107b---xugokexewugojaxuze.pdfIn PDF document text
    • 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_off0000ee9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9F 17204 bytes
SHA-256: 364cc1ed8e651dc367898f0aae8c370305f80a19edd69b3f02f667f7bc23849e
font_01_sfnt_off00011b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B53 10788 bytes
SHA-256: 10a5625b4ce50ed2b778381a54c2366d00834cd04fe98a0145f05eb093c9dea3
font_02_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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