Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84a6b818b5ed41a…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4080fda3f929399a3d8d1ae4c800b05 SHA-1: 96cb8b7cddafe6800333b16c29def66784bc7bc1 SHA-256: f84a6b818b5ed41a6e80f3ba6e988c2e3750805a2375c8c1a8fa6e54bfa0e62b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs structured as a link farm, with many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/isu7a69fff0gg99ipvhsmmd9s1/fejebarasawefowuxaj.pdf In PDF document text
    • https://workinhotel.com/upload/fckfile/58379839396.pdfIn PDF document text
    • https://assistenza-termica.it/file/powajuvape.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/41c6a5685bd441f94f74dd23073f75ac/32884994194.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/86884446626.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/48402247373.pdfIn PDF document text
    • https://slide-bearing.com/d/files/75792665785.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7645261116cb68fdaf9c3ba2b4143d93/pebivafunafavakodifem.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/4098609080.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/95539908295.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/rovajagogojeban.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/28967329345.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/54564372787.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/81f4c1af32306536b220f2589baf7f64/sipaseviramisojujud.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694a510843---rumagilotapufin.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nufubujinetefajaguvibelu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085619a1d043---lejes.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6b811fff---21649818124.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lilesavoduk.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9fd090588a63866b71d67b351976fa13/lamegedakamo.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/a50aebff0c702161b90fec408660f526/botijip.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160717f73ab58f---nutewe.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/13c5e347072591d6a97c6ade97be9ddf/wupezalepaxorizufemeweze.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/dakag.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/80626730227.pdfIn PDF document text
    • https://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/23956236105.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e8ddf12cf8dcdea73b12915f5e88ac32/61148844770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=parabolic+dish+antenna+pdfPDF 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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 16336 bytes
SHA-256: a7b94cc99e9eac826e0f1b8b2371eb172c6a7451aa3d2124cbfc78484b5aa164
font_01_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10860 bytes
SHA-256: d300d9e4fd71cbaaf5597c17681c432ea3db9d2aec978d9b471c5b027e96d8f8
font_02_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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