Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d0791f7ddc7f4…

MALICIOUS

PDF

89.0 KB Created: 2021-07-26 14:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c69b918cb38d17b1c33ad34458e893d9 SHA-1: 4bc29cfe46412ca4d38a5dc8037b24f7694eb9f8 SHA-256: 937d0791f7ddc7f4d91fc1584234f624ea9427f1d85491c0e558b589628a90f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://didocrosby.com/imagenes/file/20627024268.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60f49fbbda89ac5818bc8dd43868bfab/sutijuxitevixisarus.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/95365196648.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7f70bee9---pazabomewuzimowemibibagu.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/pedajose.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/3356443058.pdfIn PDF document text
    • http://beta-rc.com/upload/files/pitivujoregixesudipalip.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0c7612db---gifogobavizikafikimumalu.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021626144531.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/vegarufuregunapisozo.pdfIn PDF document text
    • http://k1a.ru/images/files/file/noleduzub.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/0is6oc7l0p9ckd869lbrk8l55b/zisuforozevewuvujedotiwob.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/jogipesotufamanobo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/785f22813c5eb6e8835edf8310d5e251/65778101777.pdfIn PDF document text
    • https://campermagazine.tv/public/file/milasuboxidobodu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec59c562e---96222873667.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/19409966542.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/joniliju.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/38701097365.pdfIn PDF document text
    • http://tai-group.com/upload/files/46584100335.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bf4c1ecbf77d725b5d8873e122847b02/mibax.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ffcee52f6---94026456683.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/5560600988.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/22637042089.pdfIn PDF document text
    • http://learningkey.org/userfiles/58495538198.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce7a22be1---numufukuladumisizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=frases+bonitas+para+desear+feliz+navidad+y+a%C3%B1o+nuevoPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e51c5c9da---84081591433.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_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 11152 bytes
SHA-256: f4239fafb892b79e1e8c04d5ebb6fca48a0d837dddd6f41954c137fe5e7d2902
font_01_sfnt_off00010f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 17244 bytes
SHA-256: 21c1335a3e03766bf4b21e778019a59cc3b246e190efe6d88e03560030e38b04
font_02_sfnt_off00013ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1