Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf69966727122d1e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 21:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 701170e7b7dfa7f7f47cfee42967b1c4 SHA-1: 609afbf2104a1f96c02cec897fb5235ec21618e9 SHA-256: bf69966727122d1ec4b4e33ef4aabe8f9edc533f3f5b7a2ad737d2d55e0b3d96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of these links indicates an attempt to redirect the user to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=stop+crying+your+heart+out+mp3 PDF link annotation
    • http://saydersan.com/firma/files/62418620153.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72484199392.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877b213c8d1---xexufog.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0f5c2ea7b5d34e9bc27cbe6265eea89c/62908353503.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2f84662f0f081795d7cd8b00eb990d36/nudolupajuxuxu.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202108180509343521.pdfIn PDF document text
    • https://renault-service.com/userfiles/91909828993.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/jepugusedazumisabokeno.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/36f918d9108ae7a3ae0ac0926eae3ed9/57763606138.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ce9aa90db4---27951315604.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/53009863971.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e691e44f5---83171680987.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/88540239695.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/oq5m24qsep8mmqil8p3vdrcr9h/19364116610.pdfIn PDF document text
    • https://anjingliar.com/contents//files/rageforukemivuru.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/dikegafi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a68f7f1643b---potukizalenotimibugebed.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/824o8c0u5u2tmf2aht9dd9cih6/20749553375.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ee43c97dd1750d602ba011f0c64e0657/97849624803.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc363b18867---dapiwadenage.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/96765534012.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/kokuwesikenonukaka.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/fumele.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b2da6df729bf1c62a03a78394fe4919/vexenofip.pdfIn PDF document text
    • 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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 11068 bytes
SHA-256: e534d52e5cbdfa1a95d91c7dd60964817710dec30ef41b73c3a92dc8feba76a4
font_02_sfnt_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 20080 bytes
SHA-256: 9a28fcb7c8978848d5ef9d7e0b555774d552b2d4e7d029d0246f88dc274780bc

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