Malicious PDF — malware analysis report

Static analysis result for SHA-256 19006c8df73f615c…

MALICIOUS

PDF

85.8 KB Created: 2021-08-19 00:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a77f97b029666d996493045a143166e2 SHA-1: 0fba94ce2c070a6b4f978fe38e0454c67d24452a SHA-256: 19006c8df73f615cd2d201eb58fbc6f4edf794c37d52065bd49df4b12bb6ad4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://walkandsmile.com/userfiles/file/jozomezodapetegupege.pdf In PDF document text
    • http://danieldesignpro.com/userfiles/gejojolul.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/26679162662.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/puvederupax.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160953eab9c361---70553752531.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855643effe7---dapuliwe.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/81437471197.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/21174161784.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/lirazaludajirifubejagisip.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc9e33237---tixominutijibukemivodowuj.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/lovufetigoxu.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/10226329690.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bamufefunivefitan.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/19146409053.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f6a56300c9b---17110525129.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3e1629a837a2595cffafa3d1cc9443a4/wanogevove.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/joferitokidenajuvaro.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zisizimojodemezotasapiz.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/8pk2ag95mi0oekbkki1onk1295/labewusopulakipididiniw.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/wifakajokilivazedot.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a207a5fdc---maguvojef.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f64d1f12a37a4ab55664c7ae9a405f2e/44674152371.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f8ba276a606dd5e971c02307d2c9b211/jebakimigarow.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ffa05532b70ae1226b3ee9d561f2404/viwemerafixazizana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=sony+bluetooth+speaker+driver+windows+7PDF 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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10180 11212 bytes
SHA-256: 5cfa3e61d9cd4599bda51b1146f3427aa7c4d2cf1f5517eb5271c7700d2936c1
font_02_sfnt_off00011b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9C 16992 bytes
SHA-256: 9b7a6112c77d9bde51477f14d8500a65ce962b1041b3ea6620e5d5a0ef911ca1