Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1cdd06cb941cd34…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 14:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6c2058989c174acae280badc22e5a6b SHA-1: a02a5d338c0a3540737f932e2b7cbab0f20130e7 SHA-256: f1cdd06cb941cd347496990ab8adb7168d981b9def441100d601d7bbedc17fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=hd+streamz+latest+version+apk+download PDF link annotation
    • http://www.pacautomarketing.com/file/57318346138.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/lunabo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614458279936a---xomovuniximutivilofi.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zimalotibodumugib.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7a0d2b16---vafujemilesotewaxujomoxak.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/76853913924.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614356a1a361c---87604225249.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/44587352771.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/jidutavofoganaku.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/27285817034.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/tivabinavoso.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9cdca218c---suriduvojojofufuvi.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/84069320663.pdfIn PDF document text
    • http://villkasz.hu/editor_up/11120203034.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139388114fb7---64396787802.pdfIn PDF document text
    • https://atlantidegattico.it/file/somemaxajujuwut.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vutemuvonikubupotowijevu.pdfIn PDF document text
    • https://alutat.com/data/file/72991291679.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090511832_456152400.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371f5046396---wutisatomebuxaperira.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/vusimazide.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/faxanodejoda.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210911_220452.pdfIn PDF document text
    • http://s250801404.onlinehome.fr/img/uploaded/file/lumibovidunovitiluse.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_off0000d4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BE 10848 bytes
SHA-256: 6abdef7786b7f2f9bf0afec3cfc1655c42714322aa6fbc7f575d2ba90a4e40d6
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 17472 bytes
SHA-256: 19cedfc250fa4a6ceb930993b766362ce5b47f361a6e81a3025c17522094bbaa

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