Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf938e3a327e8b56…

MALICIOUS

PDF

94.7 KB Created: 2021-06-28 03:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d3bb2c586406ba2dd082ba66661cf982 SHA-1: dafbdada954c07d67c8217ea76c38bd68a13eee5 SHA-256: bf938e3a327e8b56fc32461ca3d36c8739d6ed316a5fca477ba72e8286a260fc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous URLs hosted on compromised CMS upload directories, indicating a tactic to distribute or obscure malicious content. The ML classifier strongly flagged this PDF as malicious, and the structure suggests it's designed to redirect users to potentially harmful sites, possibly for SEO poisoning or to host further stages of an attack. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/53e1701f6217d552e4d54b8b5875b6a4/xulepomixibafu.pdf
    • http://arisutour.com/ckupload/files/kixapewawi.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4590873---pemogekenawurud.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5aedb45f7d74f2cbb576ce556b878cd1/57953105969.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/74652167109.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ef489a145195fe0895535e8aea3bdc3d/91255603891.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bd553f91cde4b99410548ddf760d5d3a/sodobobijimaworow.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb718616732---winizububodabodefamam.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec053488d9---nepaminisudubiwevapomuvo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa4f11a97f---wufuzufiluxemasalozoxoji.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/31308505515.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37053dbf19---vogix.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c01e733813e80ad339bb94905c21a0e9/mudig.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe39d72c6---vodagapedotomimivezuku.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/mugesuko.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e85d3014aacc2ec8ad18611f8268bd3c/98323952586.pdf
    • http://abogarestudio.com/userfiles/file/demurama.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fecb5262d---fufip.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kf27ol51pdfdt15dv5boek5n2b/kanuxuxetopi.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7jo2baeebjnl420kk5bslfqrmu/zepat.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915ae2aa6ee---53188964309.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35509d6c9---tumezimegetaviveduxutoda.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/togewadilixekefozegobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=all+named+reactions+in+organic+chemistry+class+11+and+12+pdf
    • 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_off00010b34.bin
1d83d3adf55199a8781c2bba5ee5a96f67a5ac2448d158790fae4da9922fadb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 18212 bytes
font_01_sfnt_off00013a85.bin
36bd076683e09de7ccf8757e2177b6ad41867d30b58888a9a41c2f4c9380b722		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 11336 bytes
font_02_sfnt_off000154db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154DB 16792 bytes

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