Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d189af9af1fd13…

MALICIOUS

PDF

79.4 KB Created: 2021-10-23 11:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f2900195bcf80c88dd0b14fe5763ba4 SHA-1: f0a13014ccfff425fbfc476296e0d760b0e8d7af SHA-256: f5d189af9af1fd13c996f291796fe2f0d03a24a46c5b27b69e4d075c2e0a46f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of PDF_JS indicates the script is intended to be executed.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://zensushialiso.com/uploads/files/27537488487.pdf In PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/wuraxobaxavufiw.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/naxajajojobiselonunori.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/bifapuruvidovapalizu.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/42955214196.pdfIn PDF document text
    • http://momsystem.ru/public/file/kepidiralufovevirow.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153a0c02cca9---vesipudaxokonajuj.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/94909968210.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/pefobikitewifugopaxi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/sasenisiwuferofinaw.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1615279f26380c---nifajekonas.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea0c30fc2---7677772361.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1616a226211df7---fisosulufugezilofineniv.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/63572443693.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf12c81c7a---natulumur.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/78191983743.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/rvoa7086bjg3curmiepp4utggl/pujesibinap.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/18451394832.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/begixizaxexujokokagafepa.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/79722561910.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/75979082047.pdfIn PDF document text
    • http://spakimthi.com/upload/files/16078144302.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/66255167088.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/jujofu.pdfIn PDF document text
    • https://esz.jp/img/editor/files/94568678591.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/laniwozogejikokevose.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=working+capital+expenditurePDF link annotation
    • 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_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16240 bytes
SHA-256: 8536a6703326ddde171a19003960b7d5be427d08f251d716cc48e3d4086a64be
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10808 bytes
SHA-256: 092839e9c96f7a6dd2fc51492dcc2e27ba0d9fcf955df0fdc2eb93f909bd911f

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