Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d4d5d3f3506154…

MALICIOUS

PDF

77.9 KB Created: 2021-09-07 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab0c03334ff77d7648f8cc3b870a8e64 SHA-1: ebbdaf2873250d4a5c6933e08fcfe8933534dfbf SHA-256: a4d4d5d3f3506154216870a4557e4307c5efa90e47a35c60e278dab41359fc24
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3f6c3c405d924eac30fac0bd6af13aae/4424477221.pdf In PDF document text
    • https://vieclamday.com/userfiles/file/54708108273.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38468be0da---88280317989.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/ziwujawakor.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zolamenivewukunatetuvez.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/46417013292.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/lipobavejofuwunexomideta.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/zumipuwifime.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c756a0de9---73048639773.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/pobiwenus.pdfIn PDF document text
    • https://unosms.us/userfiles/file/73323486991.pdfIn PDF document text
    • http://evola.it/userfiles/files/zedudebabunin.pdfIn PDF document text
    • http://allycatering.com/userfiles/83379508074.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/66792036471.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/25416847750.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/em60dhmgbsrg0g3k9qe03ngvi5/77177395929.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/zojopiziwojete.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855222ed06b---jadikanoluzofumulaxifakov.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091b96f8cad4---9253416148.pdfIn PDF document text
    • http://yuhongzg.com/d/files/97695478440.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/86040744240.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/30443434682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=classifying+organisms+worksheetPDF 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_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 17008 bytes
SHA-256: 5de562aff3854b31f605b5aa1298908605412b4e83c1b197c5fd330989b12f82
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10984 bytes
SHA-256: 0ae1695a9ed6352ebde6ccc1afb89f6710e5925d6eb0358d233b7187fb92bc4d
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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