Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f860045bf7123f4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 10:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ddffeab4ec9fa8231337d4fd65ee6a58 SHA-1: 097e7e2cfca779c14d51d9739ef9ef43069fd6e3 SHA-256: 1f860045bf7123f4b52b76fae66f5cace514894561c377d70c09516d6ca2d445
156 Risk Score

Malware Insights

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

The file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of compromised CMS upload links further indicates malicious intent, likely to distribute further payloads or conduct phishing.

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 https://www.multilandtours.com/assets/ckfinder/userfiles/files/solanumelomepet.pdf In PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tajojilariw.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/xetenikerekemewol.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/99051986911.pdfIn PDF document text
    • http://parentini.it/userfiles/files/nilavugowupeli.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8a33996d---newax.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614439cf434e6---51015633181.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/39441510283.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/82541123490.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/47375057903.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/99125497480.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/36011605406.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/mazezikasatovo.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/dexozadutux.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/74292887105.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/8130383362.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/wumosubotatukesoti.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/katanajarogijuzubasam.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/tuwofufapilatewibopovu.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/vuniba.pdfIn PDF document text
    • https://mihalex.by/files/files/pavefumaj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134802347899---tujabexa.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/jemoxemudiwikasokoxev.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/nufodotopumade.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fa1a9c9ec---zikutilurawotewigurekuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=good+news+bible+download+pdf+free+download+downloadPDF 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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10660 bytes
SHA-256: aad3dbca3ae922989d79d9f572f6a2f9d9f2f7a580c64238b0860dbf6d2420ae
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 17416 bytes
SHA-256: 2d9003867e110e2a35cb8ef51b66b33880c27ba8911d278ca782e2f1021c72fd
font_02_sfnt_off00011cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1