Malicious PDF — malware analysis report

Static analysis result for SHA-256 d648b944aa51b4c5…

MALICIOUS

PDF

87.8 KB Created: 2021-07-06 11:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ec2b48966f25b69b8ad1a5c90ccab72 SHA-1: 112715c287119f42e7c3e5aa2c64d5625c6fcfb1 SHA-256: d648b944aa51b4c5f2c557bd295e19dc93c7ec5e4a192c643fa41721319de62f
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b041cc0ed21---dudumopolew.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/hudadiiq8fpmmkppf9h5jijuho/binuwinewunar.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa972f29175---kanirozokom.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e6123c16---walufefufubibixiz.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/98ba8fc0a264ff823beb86bc6b71aa5f/14830081994.pdf
    • http://christopherdallo.com/file/34504294955.pdf
    • http://palyavalaszto.hu/teszt/upload/file/xatiwazelinajixakozu.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/a3ke473r932bdeo66ggpjb23hr/jolutatuvo.pdf
    • https://budgetparking.ca/admin/uploads/file/22034138522.pdf
    • http://serextion2006.com/js/upload/files/rogevixaxexomaxuzew.pdf
    • https://foodvellythailand.com/upload/files/kosuwed.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0526249f5d2649d89abf5090de8e70cc/pagetonavamofumed.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb418beed6f---nirigiza.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/383ab8e7bd56dd75ae17b03689c2ccde/xizefajeluwujojiwibeja.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/11f6a3072fd23e477e0cf2344c7d2460/zifopujemarizisadofitu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607de641550a9---vaniruweped.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090e9e046997---20495387750.pdf
    • http://ahcxdq.com/uploads/file/180413017635.pdf
    • http://china-miyaco.com/img/file/2021528155118.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/2eddd07b5ed8aaf872c7c037a9a8be55/xotajuvobukiru.pdf
    • http://bualuang101.com/backoffice/upload/files/31003241623.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/dba09c9abe939cfb7a4f499bae55a137/43067025384.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfe5c0048---8158745421.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1091792bb---fosimu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89e28812c.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=reported+speech+exercises+for+class+6+with+answers
    • 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_off0000ee02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
font_01_sfnt_off00010614.bin
1b7bc89225d9cba679bff5610fe5d8d7af5e6411db4f1e85cdf718cf91ca0c60
pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 18892 bytes
font_02_sfnt_off00013772.bin
38e1f3bb55dcf377dfee6630b173ed1c2cd11af7d47738973ecf92b1a4d0cb8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 11120 bytes