Malicious PDF — malware analysis report

Static analysis result for SHA-256 f677c9068d6309e5…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 05:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5df7fd58dc5dbff0272f6df47dfdae3c SHA-1: 738fd49a50b9a75f01fdeb1d4d0e190c039ef1f0 SHA-256: f677c9068d6309e5a5fc1bdf13b1f5b6f4152e1c335bf935dba87da5da8a7c5e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://daphongthuyhueminh.com/uploads/image/files/kosutitumixeta.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160963fafbf99b---15799687891.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/k3rh31lsn3msnbeve43g91kmj3/mireled.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/logijuvaz.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/wawewuganolujozasufipe.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4449c21d1b174a5cd5039bae6b8f3537/84284118543.pdfIn PDF document text
    • http://haai.org/upload/file/jevirexofuwalomivunobogo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/24189724200.pdfIn PDF document text
    • http://beiks.info/public/file/kuxozaponagakaretovel.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/6ff9ae718029333512f5152c27a486ab/13171902672.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a6c10a8468d6d054044e24b42d97be76/95978376969.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3746c5ba9---88641050258.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/40569322340.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/16384670638.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/50199016176.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b43297b36faafaaf08b95d80ef76585d/70623125324.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd65ea77a---84270852179.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/juelsn1rvsmqmtukv9ma7etle6/62272179240.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609e38a8c8918---49042148774.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa536a5ba2---58363587776.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/rogonuvazuduwifapimugak.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc89e85965---tenaferozig.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c54970bf826---65658949073.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082798add1c5---1057384340.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/24140770681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=paid+short+linksPDF 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_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10308 bytes
SHA-256: 6a69de3ab0f83a1ce26906f2012252305d45cf035ac107833176e8b22ce21967
font_01_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6A 17544 bytes
SHA-256: 6ad985753016321b6a8c187249d2a934a7e5fe72c3b66cc65f10778940de9af9

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