Malicious PDF — malware analysis report

Static analysis result for SHA-256 f72616c7c2314ece…

MALICIOUS

PDF

107.5 KB Created: 2021-07-10 02:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ae04f7ca84d82d80799548460688101 SHA-1: 5b7319b155b4900b44572d8543a4d761d33194ae SHA-256: f72616c7c2314ecef4d0950e9b6f78a4f5c200a24e7e2b9c966c857644b45404
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://studio70.eu/userfiles/files/55807742968.pdf
    • http://xn--eyt274i.com/upload/files/fixeme.pdf
    • https://resonanceacteurs.nl/userfiles/file/55652385817.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6d426ee27---17352457407.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/229e10742a96a7afa01e47f5c4e7972e/mojuxifadikiwor.pdf
    • https://nakipoglugroup.com/upload/ckfinder/files/59635799389.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bea6d263e---vojofebegupefivusozulad.pdf
    • https://dpt-mh.com/uploads/news/files/29545433272.pdf
    • http://gdgom.com/upload/file/210603142606257484cs6czzvcck8e.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/8bebde844814aa9f3ab2d88068192568/nopapagosovibiz.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1976cc53---49625888347.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16089d851511bd---felome.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/35ad2e6f0872680324fddabb08890602/50452109950.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/53633419596.pdf
    • http://mistralizmiryonetim.com/uploads/file/wokuzojajujev.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8b5a4c280a9a80161c71a399f98a5dc/63520131627.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876a0fbacdf---62938287189.pdf
    • https://aterhesseg.com/up_image/file/zotev.pdf
    • http://uralinteh.com/uploads/files/27689629920.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe33642f7e---wituxudekuk.pdf
    • http://schokobrunnen.com/idata/bajuso.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c870d7e782---21379126374.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160afa62867e4b---37914156011.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/42541ac26af67658e2ec2cde07d3d05e/guzufevupuro.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/87551843240.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pricing+strategies+examples
    • 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_off00014175.bin
850cd2a2836472c63d47bf4d224c5dd40b2289cb3763facc4e03233ef44bfd94
pdf-font-stream PDF embedded font (sfnt) at offset 0x14175 17876 bytes
font_01_sfnt_off00017045.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17045 16792 bytes
font_02_sfnt_off0001885c.bin
adc7fc944009d0b434b582868b0a5a857a4b30fa2cdf0e4222a9b0bc2a58b27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1885C 10700 bytes