Malicious PDF — malware analysis report

Static analysis result for SHA-256 824afeaa522153c8…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 03:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b799975b9afaa90330e5150b52b7e97 SHA-1: 7ba286f3da97e965b31ee8cdd962ae7a7cb85673 SHA-256: 824afeaa522153c8e4bba75ea62a4a57f7658d61f8b3ccadebe611184acb8011
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://absolutelyneon.com/userfiles/file/74700629020.pdf In PDF document text
    • https://mywayrtk.com/userfiles/file/45144213377.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607878842a9a0---rofojegeboveriwekawesew.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/53930287498.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7be00451---kokolegevagamiribedad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c21290454b9---2810842694.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bivad.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/womidugix.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083f413a07---tutigaxuvakurat.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/11be2a6b8a9729eb4abdc363ad4ac7d1/57676864387.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/dunuvupurolef.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/1606847526.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/pexid.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/96073928544.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/vimejixuwenilovovanogubo.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/66528115138.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091899062273---4480117605.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a835dbef0f---xibenokevadegig.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54fc072737---mozebovegerebuxov.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/96634870104.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/78434144531.pdfIn PDF document text
    • http://dztechfin.com/upload/file///73330249853.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/bubezakobevejitarowuwufon.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/debe7bd62e81b549289ccf1f9d6a2a2b/31456048473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=isometric+view+pptPDF 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10328 bytes
SHA-256: 20fc5676055b6b06c20de1226fda7ddbe405977a4a6f9070535caae2d0a95cc4
font_02_sfnt_off00010a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 18048 bytes
SHA-256: 0d8287e7dccfa618fb1a161c2356bb55f76429cc4b4f675c88c5a12c49081026

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