Malicious PDF — malware analysis report

Static analysis result for SHA-256 493ccaf42ee8f0d7…

MALICIOUS

PDF

88.8 KB Created: 2021-07-14 10:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01b386eba4434fb10b15e623861f6a8a SHA-1: 91f5c8ea645580a546c03b9a24eb7ba99cedbe4e SHA-256: 493ccaf42ee8f0d77555a90589216692cb40c2857d0ca7b89067be399e4308e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised CMS platforms. The heuristics indicate a link farm designed to redirect users to potentially malicious content, as evidenced by the ClamAV detection and ML classifier flagging it as malicious. The embedded JavaScript likely facilitates the redirection or further malicious activity.

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 https://nomylo.ru/uplcv?utm_term=gta+vice+city+cheats+ppsspp+download PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qulb52c8sjan93463o6b6t92v/joxurefigejosa.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf94191d7ea---kemikoxa.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/37353883851.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/de13e3mueupdk0rb22qhg0p786/dosuxafowama.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/66884796620.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34808424c4---xewetudovodulag.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/jazatofutesusazofonizizop.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/q4ofc6k69gvugh2q6b9mkqbocm/16378750925.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/38905783696.pdfIn PDF document text
    • https://luminex.pl/upload/file/mivagebukanusigo.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/cc6bdd0ca586ed1d558c5c48a24bdf50/24434311968.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/40734014163.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pedijoniwojafowarinos.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38290c9d25---68330154068.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/8g2j4pd9h23op35m3cpfuog3gv/tiwuxuxinasekiwokafoge.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kifejijaramisosuboxuko.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/8d65088c69d4174112549d29e2190eac/xobogisob.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/buxivabonapidozegadu.pdfIn PDF document text
    • http://metallpress.ru/files/37774701123.pdfIn PDF document text
    • https://proxus.nl/file/luloniliwizemowuxi.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc03ae0bd3---gusufuzofanonufelafonis.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/kepovewoza.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6d7b7ee30c291a4e1c7ef1fc4344c2bd/14146528624.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/joxuzilubinijujuzif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 17320 bytes
SHA-256: 5bbdac5931b828d9a4b15f16b2ffbf8705d7163878c08cba072e7d75c5ab663a
font_01_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF9 10816 bytes
SHA-256: bd501314af5b1363bf26bb008a050e0c98783077302c7d025e54e4926d61b6c7