Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0638d5fae9063d4…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 16:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b8d8ce0b25165f7612c0cd6db13edce SHA-1: beb08e3877282d558a11e643e878c2a7b9609286 SHA-256: d0638d5fae9063d494ca84bc2634acafedf587b2ae4cab83657af7770f5db61a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score strongly indicate malicious intent. The file's structure and link farm nature point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d4e34b31---51687197058.pdf In PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/68688547952.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fogomepaw.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/nebanabuwabixokawise.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/5492668305.pdfIn PDF document text
    • http://rs-entp.com/upload/file/16376491707.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/sejizimuvigurifabotetod.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/gowujugabudojaterijetub.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/89226134599.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/gururupuveninonefopupi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/xivipofafifolewuzo.pdfIn PDF document text
    • http://agavietnam.com/img/files/tozisijusazofufu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ebc72248---1863171709.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/28319712881.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/bojuvug.pdfIn PDF document text
    • http://medica-brno.com/files/17592156617.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136faacc2600---linisumetevazikatefatu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed30bb108c---74826593961.pdfIn PDF document text
    • https://signika.pl/Upload/file/mupodujisixufavasolefube.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc81c60d1---bimixugul.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98468cd38---webeku.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc64b466---89629889826.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/vugojogipavinaf.pdfIn PDF document text
    • https://csn-alliance.com/data/files/favudaxonarapeguxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=online+bollywood+movies+watch+on+mobilePDF 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_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 10964 bytes
SHA-256: 6a0a028a40002bfdf210c1cdd5829bf185ecc111428a5a12974143b62c1080f7
font_02_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 17464 bytes
SHA-256: 7c0143dc17b27a29e439618a6d918eedd5a9fa2139977606f0043783568750d1