Malicious PDF — malware analysis report

Static analysis result for SHA-256 181d3deb3a50f338…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 18:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0073d9c39f5ed1aabee479d4c34a665a SHA-1: e5dce87167bcb7d2ccb09599609cfeaa49764a58 SHA-256: 181d3deb3a50f338a24f895aca8a8fe417dc4e2954efce50d07ef1cec5e31b32
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised websites, including one hosted on 'exactblue.com' via a vulnerable WordPress plugin. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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 http://potlista.com/file/files/24066631519.pdf In PDF document text
    • http://studioingegneramato.com/userfiles/files/62331051998.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c079453488d---21498804521.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/1998862529.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/jidufubobuzawudixokoxaja.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/10902411373.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/09p7im2dc7hv3kgjif4gfkkrf5/wiruzoxugove.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160877a6be68c5---razulinusedi.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202108231244462334.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/53934348628.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/dusuribu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/bp45j0co9khr5rq75m0rcccggb/jekomikonelipipedujusewog.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a74d187e---63830519827.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gajabuniruwe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5ff73397---vepavej.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/jafiba.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fiparurivuwufuted.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b30e96b49---98480840217.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/12984612227.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/80531484430.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16116889e783b6---85428235020.pdfIn PDF document text
    • http://3asoft.vn/img/files/17961251141.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/0da6407d67d28a9c516baaeb575b0bf7/japiwesavomusudupobojob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+defrost+italian+sausagePDF 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 17928 bytes
SHA-256: 8132b1a7e4831de52857f2b1b21d1fa8a16a120800f1981fc4638f86c510a649
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 10704 bytes
SHA-256: 0df65a8575ad16ac64cd15e21cf8d1126c57346af643a563100b3500947cd547
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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