Malicious PDF — malware analysis report

Static analysis result for SHA-256 829ef8c58e48445d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 11:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58f1692a86486793cf105e7412382723 SHA-1: a75398cbd41b3a234dd801b2f490fe188590b929 SHA-256: 829ef8c58e48445d646474d939bf1e5e377a1712aa25029adb54de01563ef701
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://akicgiyim.com/userfiles/file/vapive.pdf In PDF document text
    • http://harmonie-avion.fr/actualite/files/pejemorebomoladexijevugez.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/jazuxotutadarazota.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/zeloxaxakebevux.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/90558950599.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9307295333.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2804bf50d---50743425333.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/gupapodidid.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0cb3be3a3e2ef3533660ca1349fdae04/53918554214.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/tisofapenazajadej.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/72267168748.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/dizefokuzisidevusepomaxum.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b48b14968---29540501573.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zomaxuru.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7ltejrp7a0avfomsk1mhc4afn0/nujetutozovadidibif.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/fexanubizutovoponukanatop.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/30755793988.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877cab9373c---31601839773.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/50158063207.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/97934153314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=adding+fractions+worksheet+grade+3PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/vefivuwotulix.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 11040 bytes
SHA-256: 800e3eb08222a8dd95c5c756028688c4cc6887c501985a4925527ce01c3e5914
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 18124 bytes
SHA-256: 2d787c4dbc6cfa2951dd2e23e591be9f9ecbc252cdcf556782044f0da562b949
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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