Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbaeb47977a82da…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 02:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a02802004413505ae7646257ff7bd260 SHA-1: c1f88e2fb4ae00180403d3352cf29c983aa6165f SHA-256: 7cbaeb47977a82da701aac60dc640b48a6fdd3c82f87c50983640fabe561db92
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. 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 0.9965

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://crewmak.ru/uplcv?utm_term=how+to+cast+a+phone+to+laptop
    • http://se-ty.ru/uploads/userfiles/file/85708367944.pdf
    • http://ruben.pl/ckfinder/userfiles/files/81113811300.pdf
    • http://color-gateway.com/userfiles/file/19339406369.pdf
    • http://architettogherardi.eu/userfiles/files/3542382837.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6df1bf48886ac7d81409836d3db61645/76635980270.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0b15251b3---sujoxesiru.pdf
    • http://akgwealthplanner.com/crm/files/90225666084.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/xumaroveziribojina.pdf
    • http://zechnerbau.at/images/content/files/zaxazetaxuf.pdf
    • http://geobigoni.it/userfiles/files/wuzexawowa.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/tuwezolojikivezutozafunak.pdf
    • http://pitin-akutsu.com/js/upload/files/kulineralukajadix.pdf
    • https://warungmimpishio.com/contents/files/xesajobirexebiwidumiwo.pdf
    • http://botosani.ro/img/uploads/file/zemisadasakatifewun.pdf
    • http://ghibms.com/userfiles/files/24835044588.pdf
    • https://wanna-drive.nl/files/File/79951639682.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bv6058tagal0q1l8fr8ptnnt1m/mumizo.pdf
    • http://immobilier-valence-agen.com/userfiles/file/polazukugunox.pdf
    • https://cambodiadriverservice.com/userfiles/file/11464724553.pdf
    • http://salonorganica.ru/upload/files/40904732082.pdf
    • http://amsaneeraus.fi/userfiles/files/14259130044.pdf
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/74596862340.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_off0000ae38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE38 16792 bytes
font_01_sfnt_off0000c64a.bin
e579700a7e5b52f2f3f0c9e2e43f0dae1c2a3a71f33ea82f256a5d64c56e2b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC64A 16596 bytes
font_02_sfnt_off0000efbe.bin
5c34496561fd227369cb77c21b18058289874f0ba87e519e050a467d9603357e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 10356 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.