Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23ebda097456909…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 13:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02da284a0ecaf95a7ff75eb1327be213 SHA-1: b8bfe4fb566ad23bac4e2c67a46a0250b85f2f5c SHA-256: d23ebda0974569093b5683147cf335d8ed82855a24a0f51d20d7c4d19235dc0f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to create a link farm, likely to manipulate search engine results or direct users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=total+quality+management+anna+university+book+pdf PDF link annotation
    • https://agencement-menuiserie-var.fr/stockages/files/rudikorilisikanugepa.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/ninidusabed.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/ralanusenemomota.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tojazarud.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc4f7507ee---defilifenobov.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e5411abdb---13009371559.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf0057075---gadogirijarivonizor.pdfIn PDF document text
    • https://songuryazilim.com/calisma2/files/uploads/4217996121.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/21043551385.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612c365e27ed7---37258181367.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160925def96249---vasubozazunanuniwajita.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d7097666---majopowepofolalazazuduro.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/gukarabolobexuwuvujagu.pdfIn PDF document text
    • https://bloomeng.com/uploads/sipub.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a871fbfceb---xepawirajaketoj.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/50769492979.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/fo25tr1e848e5mh42ar7ioctn4/65811971958.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/39829867225.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/luwuv.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/gagudilodivum.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b6e19352c6fb16cd8c38aeb8d838129b/39030486656.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c251d966199---kojidobexodoret.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/lezawa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8972b653---65524155310.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 17588 bytes
SHA-256: cd4484f58c07982011476c192e376f9910fc72bad4751bc3b01e31a1ad17863e
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 11460 bytes
SHA-256: 025dbbe0a1e70ece9b55ee0eb8394a20870acdd2e51090edb76b27becff39649