Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8cc613bab05191…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 22:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e70b1336db61a53b518a28b2f52ebd2c SHA-1: c34f9dafe1dee677140a7be54c6a0ed63849ed23 SHA-256: df8cc613bab05191e1351265459ee25f23b1255dfec27cb7e553fa554b922922
156 Risk Score

Malware Insights

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

The file is a PDF document that contains a large number of external links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of multiple URLs and the ClamAV detection strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://medvor.ru/uplcv?utm_term=nefropatia+por+contraste+2017+pdf PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e186a0cad---2230295085.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/53727888117.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/c7f4ri4bbf40gb3gggpn510tqi/vuzuro.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/94898198973.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160767e18d8d4b---53024127849.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fn8onr3hk0rpn1jqmjvh1h0cce/70390657722.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/wakitamif.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/11600638443.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c852feb95c---xukuredakazid.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/40642228553.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/53944768270.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49075810006.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbea850e18---76818094288.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/riwusonapupov.pdfIn PDF document text
    • http://greenbrier101.com/userimages/pavibimepegosekodewaf.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510234523.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612070f84c592---mefevovojituzegapovadeji.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/29124828334.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6b5f6a33e933f71af8a5271873e50a12/13595042534.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63cabf0bf2---vowozofarujujojiwe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/12863635951.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/19393519478.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/25998938951.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/60444469094.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfaf1305cf---xexukojazofezinetula.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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 18004 bytes
SHA-256: d4b0ae363e32353076df6484a8766c10773c0e20f3daebf8f546fc812bc643c9
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 10888 bytes
SHA-256: a3316302db6d0dc8334d43c31e3ac40a5cfe83cc20ccc5972f1f07684f6b8226

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