Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aaefd7585e2459…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 22:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4aa5fdb4087937de678c687725e9add5 SHA-1: 9911ef966900fda32acb22937b555c793f0bc958 SHA-256: c4aaefd7585e24593b9e9a447a31084f68273991ce9f9f3dc04905764472a5da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software or accessing malicious content. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=mobile+gta+5+apk+download PDF link annotation
    • http://nrgmedia.hu/files/file/gupununitikesavo.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/wuwofan.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b38af1c352b2c21dc5e0b3909ef9b3e3/49324007720.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/36676582237.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/dozolotixazode.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/81812489480.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/52644359609.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motapu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/77776231375.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/lomelipofapitasikamel.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/disuzusuzegot.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/79712327352.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c6b6bead5---rekapuxurajajadarepaledu.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615290bb141a2---ropufukanodul.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/tofetiruwolovosuzurazeso.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4209908cd---wopifijazobuxetezurena.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/29246882688.pdfIn PDF document text
    • https://rubfila.in/files/file/77297745951.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/maromotubefebidusar.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/30393034401.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/parujuguzedipasusen.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/wivuxidijo.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/86458541413.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/90829814845.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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 16548 bytes
SHA-256: d3abbd6cb4ef809350829e9b0705805479dd77b18af005d0b9cd6f378247a759
font_01_sfnt_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 10744 bytes
SHA-256: 65369101a4d2780b70bc2f46c79b044e4b6f8dbfd15e7c17adc1dbc44568f506