Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b9c9f01295fbfd…

MALICIOUS

PDF

124.3 KB Created: 2021-06-29 09:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fb8330430686d49246cb834938923c17 SHA-1: 108ec9370c23a6a7e58deaaf4771fc9501f53bc7 SHA-256: f8b9c9f01295fbfddd2ff1789d76d784af5948282605db89a9fe715adac2ad89
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 CMS upload storage 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 distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • 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://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5f7de41ed913716906dd8a018cace209/bezuk.pdf In PDF document text
    • http://sincaremedicaltour.com/js/upload/legufinowofaf.pdfIn PDF document text
    • https://schmitz.cz/res/file/puxifa.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8febab520---lafedutodutelenusokapidu.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/guwapadunologipulozoz.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/44217517889.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/dopezomojirefanedefuge.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/61964994883.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d78d4560---nuzusorilum.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090408543d57---52291314601.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5a7d58982b8f0381065362ef92825ef6/veros.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/julabajufizuxesajuxelopef.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/laremumebetejodazujo.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/61365066958.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea7eb216ad---getivasanobutisuxasiwufi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/lejevunumaxo.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/datuwarenefogomiwulozok.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2252323900b6e4702fe40ee25dd3d35/kerekobudosusafutu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0eac9a55bcb6bafb1e5a60d372a83847/jomawewora.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede69bcc57---jogarokape.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/4f6502d93e8dd95a97d1c5acceb0496d/tudamux.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d820d702ce60344e7f6a7346baea8e1/11457089763.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/0mc8iolsf8q4apm88ug3bmmr24/zutulev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=just+one+day+bts+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16427 9240 bytes
SHA-256: dd85524d8f954d1ceedff16e70b821856aecbd22d9fb86ee937713ccbd1ee292
font_01_sfnt_off00018275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18275 18456 bytes
SHA-256: 9e61e7e8cf96861c7685d4bd010616bc9210cd5c9d532ce66a99290ba0ccd337
font_02_sfnt_off0001b39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B39A 10532 bytes
SHA-256: 28107e85f73b05ac8d0929d80f4eb661c56462e678091583e44291baaa2bf203
font_03_sfnt_off0001cba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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