Malicious PDF — malware analysis report

Static analysis result for SHA-256 383a0255eb7fc2f5…

MALICIOUS

PDF

83.7 KB Created: 2021-07-02 17:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff378c7ea01f921c68a6de1d5d84d533 SHA-1: d198cc43095093a6a172b5377b4b9d8d68647a2e SHA-256: 383a0255eb7fc2f5bec02142b39d798612037a2bd9177f6559b3a64f3348f1cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to manipulate search engine results or direct users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=insert+pdf+into+word+office+365
    • http://www.moyekolodin.com/files/43596514597.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072fa0fac6d0---daluzubobiwofuliremijobir.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/858pg09at3fcu2dqd7metpg120/77666224413.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe4b05ca24---5230616053.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210618105905770308n9g418.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13e2780be---63955480716.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11b844aa5---sedoduguvegewoteradiveda.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7342a44d63---vufirejudezuxofogepafo.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97098015b---26433673707.pdf
    • https://buka.ru/sadm_files/pugijofotosekito.pdf
    • https://brod-plovdiv.com/images/94668289010.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/eda5fa9d231c709fffd96f20e25eb995/jebuviforadalawi.pdf
    • https://sy-tech.eu/file/32549359405.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/2431f0fdd83abf7856c325f8312af333/47073868949.pdf
    • https://mudraconsultancy.com/uploads/files/xijukubezuperos.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/884eb3e78425ecd5787f389be3ee0e3f/zuwevipafisawusufuzig.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4f477577a---menuwagapawinatakexokosax.pdf
    • https://euinsuti.ro/app/webroot/files/userfiles/files/90096068940.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c426047d1e4---55427885235.pdf
    • http://vom-ragnaroek.de/uploads/file/dowutesifogarodarife.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/44683353896c6d855967c88f62f9e5d1/36496279617.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-15/20210515085505460630.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c36795dd5---87759526178.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_off0000e41c.bin
3966ef5b122e263be151e7eec1d7e634f1b2d7d158d83cfbffaf53be4a2d1b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41C 10916 bytes
font_01_sfnt_off0000fd9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 16792 bytes
font_02_sfnt_off000115b0.bin
bf76c3416af67df42ddbc3267f72a2cc8608904b03cc4ea611de3f936e7f2f3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 16876 bytes