Malicious PDF — malware analysis report

Static analysis result for SHA-256 f352bba9be96d397…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 22:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c5a9a5d8a712019daf7c601778a0bfd1 SHA-1: ed1aad402db33eeba6cfe703e31ba02c2583c42c SHA-256: f352bba9be96d39754b3e6a74f49d4722eff957fc02556925bf3e97e30135843
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=alpha+nitro+apk PDF link annotation
    • https://renault-service.com/userfiles/3457167563.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/68914578319.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/5299967811.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/82736133460.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/xibupututaxaponetakup.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/refosuvegegexowuwepov.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1278858a---98547051551.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/sexemun.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xaxuz.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/fanokoselogun.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/44285454042.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/xikajutazivorarajogojazo.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/29751266430.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/81281486246.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/93495479657.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/26702902672.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/rakazod.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/20278421278.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/75347915356.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4bfcc6ea---fifemaxodeke.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/22164632812.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/45062571481.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/liwujobakoraxivulubemoxok.pdfIn PDF document text
    • http://hkwwta.org/userfiles/44750467606.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/94224186944.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/pka13qg2o94b9kon8ck55fihvn/76073486742.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_off0000c28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28A 10120 bytes
SHA-256: 64c139bc3dc6856a8eacfb574358deabfaa9febbce335043dca56e4e5f9af542
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 17864 bytes
SHA-256: 923ea2bb06331600a16ddb4a3ab999cf05af84cb988fc6d56cd220b2f887b251