Malicious PDF — malware analysis report

Static analysis result for SHA-256 2843e4e1ebb1407d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 15:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a0ab0c77a2fb159b711bbc5dfb718f9 SHA-1: c3dc6035b582b9d25a46ab68ba2cca5c85af8d48 SHA-256: 2843e4e1ebb1407d63f82ab9821f06b918e9f1478c9d6ea4ea3764be6f2aaa12
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to lure users into downloading further malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://runhouchem.com/upload/files/43168317140.pdf In PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/24906733731.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lofusol.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40666506679.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/03aa31e8565540cc33fb7456e370193b/44487200639.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/jivekuzew.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/kakon.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/96044774446.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/basarupasosewunufekopuxew.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///99565043093.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130125132357---fazog.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9588bae91---siluligujopajume.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/zusixopujemotewit.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23391873296.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/80289991550.pdfIn PDF document text
    • https://dafelia.com/files/79319943054.pdfIn PDF document text
    • http://elitacasa.it/images/file/mukabotofapuribibero.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/68332058939.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/dagosoves.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/kajojibiwudofaroxemomexu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138077e8d327---wukola.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/571594408.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/uo3rh1vetstojtdcj3t66ehfkg/lenorupewe.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/93523458194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=top+5+free+fire+diamond+earning+applicationPDF 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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10892 bytes
SHA-256: 7d9f8762fbee207539c1456bfa2b9cef7be6e3ab97d8ce22e6087515ab06088d
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 17392 bytes
SHA-256: d0e6816366692d1bbe5534638b257b033411d9ba89b1fc12286eb8468b856c2d

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