Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9497e0b0c80ab4…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 21:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c64c0100a455dd5877ef563b62db8238 SHA-1: c3de1a68af0c1ab501b4150ddca398475fedc8f9 SHA-256: 2b9497e0b0c80ab49c769292c17b6cf788220b389574aca79925a11f266682db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

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://dermatologomiguelgallego.com/miguel/fck/file/99006476928.pdf In PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/66231145681.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/dawoxemigam.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/giwinakejisifuzidudit.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/deruxemogelirodalelano.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/dixetemo.pdfIn PDF document text
    • https://hotelcorona.ro/files/30154001062.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/buroneserubapawaj.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/puzerawewid.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/warafosamaworojono.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/40745084288.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/21574110442.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/livuxariwaruvopuvegedivu.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/24066342107.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/21053546110.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/bipazukajipize.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/niwevoz.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rewerewodewilanal.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161356611e892e---sabadaloju.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29706795311.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2a9cfadd---60403711517.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/22366571347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870ec8a1c4---52971693338.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/mekikapefekax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=send+random+text+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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 14260 bytes
SHA-256: c6e3811e033b7f5751e1500f7135babcee1025254cc0dc8d1a2ac38a1bf1a4be
font_01_sfnt_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 10384 bytes
SHA-256: b5aba7d6104934a9db568a8399665e77cb17865f928647356223d1e6c8de5e20
font_02_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1