Malicious PDF — malware analysis report

Static analysis result for SHA-256 54555de20887f8ac…

MALICIOUS

PDF

95.5 KB Created: 2021-09-02 09:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 537364d5817d4f2500e60a5d7ff9cb7f SHA-1: 16e8635db023b42239d9ecfe48e0b44bab3fbd7d SHA-256: 54555de20887f8aceb8838bce22225592a30f888da4a712d55f810bc9771beda
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS uploads. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely as part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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 http://fly.no1-yes.com/userfiles/file/79876935025.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4e427bcf8e6b2271a14e8d79da8ea886/lumagapixozafujok.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8db9a0f28fe077c488e7cec6d7322d4e/vefanukitamijer.pdf
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/migotudobevusi.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6aab4cd182a94d627e45454af7b3eb35/rezaxujalonuludap.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u7k4hb63r3suqj149319o5lap4/sapufegixe.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/datoniweluxaterutitexido.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fb35e3fb8f86460df105ccdaf12b58ef/piremujazowe.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072c4b3980dd---vibenegaropasub.pdf
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/paxikaviwupovesivisijefa.pdf
    • http://studiotecnicomancini.eu/userfiles/files/25243617409.pdf
    • https://dcmheavyequipment.com/admin/images/file/72490332125.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/39102386168.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/koxinujewo.pdf
    • http://jiehuist.com/userfiles/files/47614090686.pdf
    • http://fdceta02.fr/catalogue_dynamique/file/tilebegejodeludemenusax.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/i8ahn6qok2j8kr2bti0h8nasm6/betinolig.pdf
    • https://nadinerogger.ch/userfiles/files/lepibe.pdf
    • https://perfecthospitals.org/FCKeditor/file/57976094650.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4402f0e3a1---14236817809.pdf
    • http://csc028.com/userfiles/file/20210814062057_al6xea.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=lauri+housewives+of+orange+county
    • 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_off00011211.bin
b4176d8a1e87225d0c41b12a55309b4ff6ab26e62ec6666363f9d7b8d612e219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 10892 bytes
font_01_sfnt_off00012b5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 16792 bytes
font_02_sfnt_off0001436c.bin
f97d16a89d81f4dcbd482b5be9dfef47bf418cb560fbbf4eb3e59d9817e67f89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1436C 17180 bytes

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