Malicious PDF — malware analysis report

Static analysis result for SHA-256 824e563891480074…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 08:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cbe409660dca411084f5101182a11cb SHA-1: 159827f17ff0a0173893991c124946d9fd23a70c SHA-256: 824e56389148007454d6c4f761c73d320ab1b305632f7b1e08b95e512d533853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised CMS upload directories, 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. No scripts were extracted, but the presence of multiple compromised hosting links is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5361a4f048---turosekoperevenepifurifuf.pdf
    • http://porpora.biz/imagenes/imagenes_contenidos///daxofekevorunerikozuvoma.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b623a6281---komusajinepovaloluwutox.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/543cf005aec69d9e9b1388edafa6fbb6/59530196252.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/90d600d406e7a2e6fd4728f74d9e236a/kokakorubedikunapan.pdf
    • http://metapolar.hu/tmp/15010103301.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3c818dc9ddb5a9d11a132c787a149f26/61929584225.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2d17c120---zipesenugimifemilul.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16c1d8cb9---36200335025.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5lgtoc8a60edaecghv7pe3dv9c/11767962392.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/nipaveto.pdf
    • http://poslovniimenik.net/firme_data/files/pawalokavukowilosepe.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2fc0fc4e---3156516805.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/66c633475df9a0d617b4f695e9ec650a/69365228982.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607902d7cee66---naxejorajaf.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fcbfc23d36e948983f725d59493769e8/39729972645.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160844369cf747---97515838092.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b485b14066---zenibizonisabujenisenatim.pdf
    • http://bygreenpure.com/userfiles/file/nufigetovabagidigax.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5ae8a15b---95768031774.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8da825ccf6c1172a7eb2a0e03e03952d/80549693923.pdf
    • http://acmemask.com/upfiles/editor/files/tudur.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607992dff10cd---53629399584.pdf
    • https://unosms.us/userfiles/file/59508044647.pdf
    • http://allprintusa.com/admin/images/file/96020282480.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=morning+pee+smells+bad
    • 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_off0000ef78.bin
c295a8651a9b0d48c9e2e1add4be872a977666d871a5b8b48c3ab7e1f780a507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 16916 bytes
font_01_sfnt_off00011b69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
font_02_sfnt_off00013380.bin
c20896b25afb17ee317865e8cce463a227f3282ac67e2f8a78c5fc9f7329b791		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13380 10772 bytes

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