Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7954aa9365bd0f1…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 16:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebef9cd71eecd1d273c88b739c412c89 SHA-1: a8e397cdbe31a61ec46ca5a568dd4ebda33e535d SHA-256: e7954aa9365bd0f1792f7b0ae87f4a55cb47b037ca42103f130f3f16a3364bab
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0219c1cdf---34587644462.pdf In PDF document text
    • http://taiwan-tsai.com/upload/files/viwopunogofodinalomu.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fitowi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/mofewedosopanoloti.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/48450742452.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/g4ue2i7sb3q2nqegdjtoghkulj/46476703591.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/17898212690.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/41159304913.pdfIn PDF document text
    • http://bienbao.org/uploads/files/4506809863.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b4c509f1bb1081b0f2fc8f7e001c329c/demirufenotifisutuwuputek.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/75268750847.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/redamofarifudarud.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108042015218423.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/ritogobibu.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210815060010.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e9arofft5vpogcq4s1ak8gv286/foxasisenin.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6cdc2856ba64df72caca67ab149a1fc0/fazuw.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4f143c7ced6d651888b2da3a0cf5ea62/93670621445.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/rajoj.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/98007092050.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/pewisizam.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff5a0251e---52912119125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+road+less+traveled+pdf+download+freePDF 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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF88 18740 bytes
SHA-256: 381422fe615d97da9f44cc6e099f176c51bdc40dd95838366a5f0d110f6cb5ed
font_02_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 10616 bytes
SHA-256: c6abb7233138b0491391df9a41b8885c8215fcf41587f85a818470b5258fa733

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