Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaf92cea24e9ec1…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 03:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc62f7e216231d2fe35d000458e243bc SHA-1: 1b8862c0e932a4e7e7df340fac27af5b9af10b79 SHA-256: aeaf92cea24e9ec16ccd506527c32c2f503fce8041fcfba700f261f942e78758
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous external URIs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=free+rom+for+ppsspp PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aec1f1698---zujolulilegorokawi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mujexepoma.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbe26233b4---79697677791.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/toles.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/94413286804.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/tukemofefot.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/bunafanopozez.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/36963346705.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/5930479759.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/joxiwosejiroriraxomewe.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/99556266712.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388a4b84a48---58012182096.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/1569990690.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/32866879877.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/38521553472.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/91564881916.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a41f392262725f057b9d7f862e48320a/duwozaju.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/58952523129.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/bunuxerunominefemer.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/konujubasuru.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/22644457406.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/felunuwixofefagaxo.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/99637532835.pdfIn PDF document text
    • https://frisch.ro/files/file/sakugofiwazuki.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_off0000c3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F7 9996 bytes
SHA-256: 4f0a4b73207e4e1bf439191ea90a8457ce2509f46397255eee387eb873f218dc
font_01_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 16996 bytes
SHA-256: ab28cdb9d616f9da80a377736bc1dbff067c9a7208761d7a84b8c30639387478
font_02_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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