Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fbb4d681d9c0a5…

MALICIOUS

PDF

77.8 KB Created: 2021-09-13 06:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a74594446aaa96a39e2776b005f28da SHA-1: 3679b166ce774bfc92474c2b6f340c54bff1a00e SHA-256: 99fbb4d681d9c0a5f466fa3ed4ad184ad0d7e8f68a9e56d5b1edd880a31a3cba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to external PDFs hosted on various domains, some of which are flagged as compromised CMS uploads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dakotaterritorydevelopment.com/ckfinder/userfiles/files/kudijadajoborurajukuwod.pdf In PDF document text
    • https://mayphotocopydogia.com/upload/files/73599239114.pdfIn PDF document text
    • http://dnepropress.net/files/file/nokafupenadanum.pdfIn PDF document text
    • https://linker.tw/files/jexetulalazatos.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/funusubas.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kelilesedazubifirulanidev.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/rezewekamakapiwexafo.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/kesodagakelokipagib.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/dedipunefaviwinov.pdfIn PDF document text
    • https://mytopics.it/uploads/file/bomeregexigit.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99fa797de---31043418856.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133462f603c5---towamojazasewuvufefo.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/nilorimonugijetasem.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/menomotumopoza.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/39339654571.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/8290253817.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132d7d4f076c---sefidajepaleni.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/24313479960.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/25782576261.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xisizisevaxarud.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/642c4045e91786001adc9067e51d843a/13591265762.pdfIn PDF document text
    • http://onelove.cz/file/wupalibodemoso.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/pujojin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=upload+qr+imagePDF 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_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 18800 bytes
SHA-256: afa8ec5fb41bb9ef3dd4b9aca9200c71ab482e29de815a4aa38cb06616f436e7
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 10520 bytes
SHA-256: 8795fcfbd4b96435aacc22824c7b48f54dd05a6cd3106242c91275bf2950b828
font_02_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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