Malicious PDF — malware analysis report

Static analysis result for SHA-256 0330876d4fe83564…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 06:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc8de036fb851dca6fe0602d0ab964bf SHA-1: 0d94790c66233e3453b291cafe479545da453ee9 SHA-256: 0330876d4fe83564ac2fce93ee755557a596e261712e00b3601fb14c93163efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites. These links likely serve to redirect the user to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=cat+in+the+hat+id+ego+superego+worksheet PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7e7697b1---82382807876.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/96642994304.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/8405641105.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bf1ba2d67---50665499897.pdfIn PDF document text
    • http://acril.ru/ufiles/files/wibaripaxuvav.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160836c03f2f68---zaxopafibetub.pdfIn PDF document text
    • http://juentai.com/userfiles/files/71121085122.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb630cc858---47458970503.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62c5901e9e70203fb4cb8a8d5a19bded/desefuvonogonazebewepi.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/fiwizejuzunufiraza.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/41973025529.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2c1e07e5151055e4a992284e2ca44aae/17714632923.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/31411407137.pdfIn PDF document text
    • https://tmtteks.com/files/31548241802.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074466dea9f5---34942106.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/90746707969.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/karavena.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/99924312868.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/0b70fd88e9a108184a5e55c729b2d1c3/gudivexomexa.pdfIn PDF document text
    • http://canoeing.by/pics/files/23639916505.pdfIn PDF document text
    • http://serting.eu/userfiles/files/11213457466.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/99812889075.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/740fc7f216223e6222736f88b9969c93/moduwarajafugidowakoxilik.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6775f03b---jofolatis.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719c339f812---kupiremenafadunabuzo.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_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 10936 bytes
SHA-256: 1d326f2071e42e77f6a4672188bfb0346e871359498884fb8636914689191d11
font_02_sfnt_off000131da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DA 17792 bytes
SHA-256: af892393725a5a6b7aa37bf4ba31c7c06e6bf27a540d23814fd13d7b7ea88109

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