Malicious PDF — malware analysis report

Static analysis result for SHA-256 d664228344a29238…

MALICIOUS

PDF

98.8 KB Created: 2021-08-01 00:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b710b63b25455cfe4639cf2df448167 SHA-1: 47f4d1285a3e5606149a89d838b94b33bb7ab29a SHA-256: d664228344a292385dd2e7cca401d2782d270925ceaf6dd1a8a05fed9eef3fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link farming. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.bluefashion.cz/ckfinder/userfiles/files/1656252834.pdf In PDF document text
    • https://egf.tw/test2/images/file/71387011647.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42b32dcfda---42315064086.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/oaq4pg6tetf7hj0thfctgec81l/31934265140.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/55744006984.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/61367577526.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/91373456200.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/4749771546.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/986srjjqj3b5emcreebmi4vhff/50238803274.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d633f031799---wizevibusaxotukowef.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tavakarekogolatezoso.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3c749d51a3cf71050d28d1d6c6b74bfb/64289319429.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/nexane.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/nigajogozagobawofige.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/98083435192.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cc5d61fb2afb5d0eda63f1654fd01ae8/48043341011.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb48239368c---sosasetekojevo.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160886ebc11295---16825032380.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/farukalavikofuruwogotirij.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/64974992679.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160830bce62538---97374779577.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/96943918872.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9egbkeb6pgq8f8marfcu6a1tah/28242175602.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f3d423e69---pazivixutaribadaxiwaxas.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/15385bb703ae230c056cae126335522c/bovakoxetexexulasutaxo.pdfIn PDF document text
    • http://17njl.com/userfiles/files/serafun.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dce29e183e---bisemuzifi.pdfIn PDF document text
    • https://aful.edu.pe/ckfinder/userfiles/files/15492243052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=interpreting+graphs+accelerated+motion+worksheet+answersPDF 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_off00011d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 17104 bytes
SHA-256: 24baff190b789de7bf9955a9d39b7743b76bee4ea6da88e0c461e7ffd897666a
font_02_sfnt_off0001621f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1621F 11092 bytes
SHA-256: 4f6e9610ae10ba61709355b48d69bb78cee668facfff4e05eccfc2ab1673b064

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