Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caa6289f263f821…

MALICIOUS

PDF

75.4 KB Created: 2021-09-05 23:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20a3bfc68e497b272ea465712b7e2a17 SHA-1: 68da2178ad253027245dfcff484a9cacb8007f0e SHA-256: 8caa6289f263f821002e33763b003119987e51dcb91ebb0756e28250b66167f6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://gyandeepjkss.org/userfiles/file/28675904337.pdf In PDF document text
    • https://ckmandarin.com/uploads/jimuxowimug.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4ea2b901---xanivewojarefo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d5a8d3def627231fdd2ea89e21a70894/90404786021.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/8l2hc3fjvi4u8ir8jm1eqtn24j/11682335533.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gi92vtftlbs25e200fgmr7sjrk/12117154046.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/233584444.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1181a0443---73805708959.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/fososavu.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/23334089081.pdfIn PDF document text
    • http://xtra360.net/campannas/file/pajujemokubi.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/funijulufuxivig.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/12554397336.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/60021631192.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/iee4ed8dpufc9alk7uhnve9bp0/kujelerorebired.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nf8pv4odtdhod97b7kpqr8phdr/bekubisodubisuzewazibe.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/b21cf11e653e2997fca1c4cb46b8fd58/sogov.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/sodidomuvif.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/99240629815.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/83905042945.pdfIn PDF document text
    • https://m3csrl.com/file/fagidemesodoxofagixajoga.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/23673031804.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/dazarepivuraba.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/df40b210ed310900fa0c2bfb068a39f0/muvifijafikefawimibejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=kamala+das+selected+poems+pdfPDF link annotation
    • 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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 10476 bytes
SHA-256: e48edc4c90929cc576c03dec391248c7edc4633891754fb50fe665eaeb8fdb60
font_01_sfnt_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16460 bytes
SHA-256: 8818e8033eb35912897b4490a2a0fa6f565b7440841a7e6ec57a2fd40b53d69d

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