Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd751ee2a652a120…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 10:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cc770ab3b5541354498d70a93d7a4192 SHA-1: 485450d2ad59fc48e743d25ff5b714ceb535ca01 SHA-256: dd751ee2a652a120455f298979b35dfda45750afab52d57342da9056b290bff0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ettorebelfioreliutaio.it/userfiles/files/24814594829.pdf In PDF document text
    • http://whatdwellswithin.com/file/40168059743.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/nubujovepenemojajinobo.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210919_77DDEA0DAC5A1FDB.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/49617180776.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4b6be778f---suferet.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/48101559706.pdfIn PDF document text
    • https://protrialse.eu/files/files/40888635118.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b082bfc7---gipipikuzodowidaguko.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/92700572844.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/venupoxuxunufilidofulem.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/wogupik.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109281720131894.pdfIn PDF document text
    • https://netpage.info/userfiles/file/34964982021.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b492a71047---74929899723.pdfIn PDF document text
    • http://centromp.it/userfiles/files/kutepubolekededimo.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/xakepiraped.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd46e6c6e7---gajizorikutarififizabat.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/fidodunerilomo.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/9465395736.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee699e5810---watupotokovapet.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/saruwolovif.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/79641033255.pdfIn PDF document text
    • https://plasy.com/uploads/file/watetuw.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/zibazolojuxaxanasusavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baked+potatoes+in+the+smokerPDF 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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 10756 bytes
SHA-256: 9fbc197de3e1937e0af76b2f9601b0653c0b1e56a16cc9d4094de0bb1be0d620
font_01_sfnt_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 14652 bytes
SHA-256: 5df7e31912efbaf9fdd617041ec2f4e9056dce77b16b25a3f4f2011c2d7dbfcf
font_02_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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