Malicious PDF — malware analysis report

Static analysis result for SHA-256 42783b2744b8823a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-14 02:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2eafe5648cfe0c09c2ac5626daebf36 SHA-1: d59881e1d9f2ffb3f06158541b1c3e073df62f9e SHA-256: 42783b2744b8823a055cab518ad1c8cb44196875a79b7a1e1669747bee4a571b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The primary attack pattern observed is the use of a link farm within a PDF to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irepairplus.nl/app/webroot/files/userfiles/files/36604647615.pdf In PDF document text
    • http://novafish.it/userfiles/files/53909810939.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375854df335---babirugoxifegifimuwogef.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/k6j8vaq5e9sivcifiae4vibdaa/fafafajegofosageja.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/76220359401.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/ripokarix.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/dupinagazoz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c9e4bf3789b57e72dd7c59c3792e1727/zomurulobimuzadode.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/51555730310.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/bifovokosutifo.pdfIn PDF document text
    • http://shopabrang.com/images/files/89307087467.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/38320845981.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/damow.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/digekamajiva.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/gigibenurasifikevi.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///82225086726.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/76080656644.pdfIn PDF document text
    • https://songhongresort.com/img/files/97390868778.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa675c5c1c---joritonododaritagexesazoj.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210907053710_hsnogd.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/5532561753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hello+world+program+in+android+studioPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/56212317270.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_off0000bf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 10912 bytes
SHA-256: 460a7989797923a4d307b553c2283d68ec394dca6bf755ca7f393df6b930c24e
font_02_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 16468 bytes
SHA-256: b31a025527f04f97305c3b94b574d4697f5018b543afb845547c8ce73706538f