Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e773eb88734ad07…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 18:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25b5876c21fcd8a80df66abf40af227f SHA-1: 15e6dbd8a21dcffd16d2eeebaad313bda234b1ec SHA-256: 3e773eb88734ad0780f629571805ae1ce6f5ac8b25d428e2753f5ca2efa78cc2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of numerous unknown URLs further supports its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1cf9cba8---18360497150.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/dojuxawovonotuxameleke.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zoposewukututodem.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf4784c7e---63714511617.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c5hm85oeubcs4a4kmqqgcod7n4/130218247.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kq24kmeqoqs8i64rafaj26295c/zotekafav.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac4e67f81---41744219370.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/5i7uivd8ovdka7sh2s4agvui1d/vizejuduminugowovijodawon.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160726b8c8f7af---zotanirazadoraperiwe.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/29267069229.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4859ed5fc5---bidovarelaxifugonutabojuz.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/hfeotgqm2r21en4g97u1onkfto/60940664581.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/57507338618.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094359137879---robusebena.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/supakirumunusisidox.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/vixewozujekevasigozipurit.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/bl7hkh5v7p3q94g6naee10r929/85522236962.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/78628164994.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/clb31lp2p3ihlfchctf1b29bl2/60680345921.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/20461075288.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bf0ccf7a3---zovowutepav.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a057c4b5c---nuturuzurotejizivezemikan.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/10852d0a36c9ea4559a88220f606800b/topalorinewu.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/revagemoxinapuvuzem.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9q3uvg6qa709of9vlgbu5qhtfn/71020741831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=destiny+2+master+nightmare+hunt+skolasPDF 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17496 bytes
SHA-256: 06627ca3583754a9fc567552213c06d82bbdbbd70b45a8d1e3d9334ff5daa358
font_01_sfnt_off000115c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDE 10980 bytes
SHA-256: d8ae3da7d487a425a9b11664b202c824a9472b34a2eee83de159016b952aef5e