Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5549577a4827391…

MALICIOUS

PDF

72.6 KB Created: 2021-09-10 11:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a14977a5e7aa1631fc54d324dd495452 SHA-1: 21b9431e8256fc4872a7265ba75b95507f9eee39 SHA-256: b5549577a48273919b919f8e29717ef0470b1f05254c5491cccba928f9803750
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stavo-bazar.cz/userfiles/file/nitofag.pdf In PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210902055817.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133caff27408---dusem.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/damerisoduwifig.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/28659934952.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/firebefajudazimasotufek.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/vaxopoxunege.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/54868797577.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613956d343936---junigiruwetawuvufuwawe.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/49107554704.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52251842170.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210905_0E4F2A5CF7A5439D.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/70982252927.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0bf0b7b1---89171194975.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/38445315087.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/paritezojufigerivorenasuv.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/62750698295.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138df378c493---narijufomemixuxu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51c67f13---51868111221.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/wiluxow.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/61062319297.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/velubuforegejijofatira.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8ad9de87---23580103502.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19526042079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+paid+android+apps+for+freePDF 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_off0000b9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A4 16864 bytes
SHA-256: 587388a0f991cead1b9be6177430e8eab0ed65901894ee32e1ec7866adddf7ae
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10568 bytes
SHA-256: 9e68a9918ed358b30f1e99de1d1c0950085b4c0920d2a63071f7cdeb94433e06

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