Malicious PDF — malware analysis report

Static analysis result for SHA-256 46837325114b656f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-22 11:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3788187ba2307f113cecee5a0ca8c8d SHA-1: 7359eeff41d5b0872dc62907c46169432aea99a6 SHA-256: 46837325114b656f257b8121ade8e6d8c5ebc3605e43d289d2e9426043bc41ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it may leverage embedded JavaScript or exploit vulnerabilities to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://templeton.sk/userfiles/file/45793732279.pdf In PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/fubukoz.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/tafanemibubetujovuk.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/39209394736.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/papejezefejifupofovediwi.pdfIn PDF document text
    • http://stroi-sistema.ru/img/rogimipevaxukukevotavotu.pdfIn PDF document text
    • http://reylab.com/userfiles/file/repaxunetig.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/29914619565.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/66148104382.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109150518595557.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/suzul.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/doluberewadub.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/65718400497.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/bidufibopudetekazidogap.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312c53d60b8---53443993654.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/55590880687.pdfIn PDF document text
    • https://digireg.ch/upload/gugejikixas.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/sirovasodupufolegavogu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/73615573377.pdfIn PDF document text
    • http://orenprom.com/img/account/file/gogoxaxojizubefofareserom.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/20883502866.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146131c3ae94---zulonujusojopetazedoxij.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wabewifikobetuzexabawore.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5b5fb1bn9gk00e0pudpb61jfv0/36429952793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=save+battery+life+on+androidPDF 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_off0000e658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 10576 bytes
SHA-256: 40184686c059baa82c9f67835a756b1ae4ae2d688aaeeced1037db8321f611e2
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 17928 bytes
SHA-256: 8a018d61ed1362cedca7e3aa00d47c31cc3d46b74375e0de79942fcae3ac1e2a

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