Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccdc050beb26eca…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 06:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04498231248bc493b21f14878a88fd8c SHA-1: 4a1e8bf17f016532fb87bab8045060dd299fc8d5 SHA-256: 1ccdc050beb26ecac3a9a6dcef39e235b121590990095b0fde60886b0885340b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm pointing to compromised upload storage or disposable hosting. The ML classifier strongly indicated maliciousness. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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://sincaremedicaltour.com/js/upload/widim.pdf
    • http://thibidi.vinadesign.info/uploads/images/files/80854464385.pdf
    • https://biocoils.com/img/file/43669363969.pdf
    • https://harmony.im/userfiles/file/20880902748.pdf
    • https://netiko.ge/img/Data/file/76731822441.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/fubuwamasu.pdf
    • http://mayinmaunhat.com/upload/files/54808912735.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/88981432385.pdf
    • http://one9five.com/userfiles/files/90551288399.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614220632cde7---bakovewuzuz.pdf
    • http://veszpremlizards.hu/_user/file/tizawotufilileli.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/45c6b7b8bdfd7be92da129d2ed535161/86209031488.pdf
    • http://mcutech.net/files/16109719695.pdf
    • http://aaaexpressac.com/userfiles/file/76048270320.pdf
    • https://iva-vietnam.com/userfiles/file/62317599234.pdf
    • http://andlupa.com/userfiles/file/16056287475.pdf
    • https://iaido-iaijutsu.ru/userfiles_exc/50057830640.pdf
    • http://thecuriosityshot.com/71000308284.pdf
    • http://tzsunup.com/upload/53806849615.pdf
    • http://bftt.marketsearching.com/upload/files/runepovamabizuxe.pdf
    • https://fong-cai.com/upload/files/towadetoxesewirojilug.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613930489292c---61053343915.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=android+transfer+apps+to+sd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16792 bytes
font_01_sfnt_off0001010a.bin
7a49beb9113088ecda8f8d4ad925ebbbf8a66b3aa98b59780cc788edadf378fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010A 17276 bytes
font_02_sfnt_off00012ddd.bin
9f40b914689f590d7a2ad88b2f78041f2f7ba1dae9fc2ccb3cf1192481aaf6e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDD 10428 bytes

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