Malicious PDF — malware analysis report

Static analysis result for SHA-256 627c12927e441506…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 00:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 571fbc7c2450d9931cb9e87ab01cdfee SHA-1: d344ef7e1ce4411e18459f8a4137a6f2f361ea49 SHA-256: 627c12927e4415061541d7ce1a5c6ffbfcaef027b04355e0a5109373b9816581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=gangstar+vegas+mafia+game+mod+apk PDF link annotation
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/sanutodawamusewin.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/gufozugafisovafawig.pdfIn PDF document text
    • https://ntc-container.com/upload/files/vuparofanimupiw.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/rotixoxegeza.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mosejikageginupired.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f020abb68f---11250080551.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/38662862727.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/vuwomubunowozotewosaleve.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195513303821.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/tunuzoxobupogijalef.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/aa87c3307b5d34f6e1f36756324600c5/37136739202.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-21/20210921050400681242.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f80a31a1e---20286034907.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/14456376592.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/27607369404.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/99148240478.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/laxuvavemudolifawipijujif.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/widafojulikebifovubi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/wawutuzivo.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/31814159920.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/4182487149.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/79713985625.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/xunudesamutom.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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 10992 bytes
SHA-256: 7529deda6df4c08cbdbf8c1c768cb700b2f16779787c68552c2f44d2ae608b40
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 19980 bytes
SHA-256: 3e262e32e071d00d37ceaedd83c8e93246cb939df5a34520d9a92eafdb430ead

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