Malicious PDF — malware analysis report

Static analysis result for SHA-256 c96d41cb332f4a3a…

MALICIOUS

PDF

89.4 KB Created: 2021-08-03 01:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42339d9ed1a53a541cd203d413536d8b SHA-1: 756f4181cd48b9ed1dd489252e8648bf86d0de21 SHA-256: c96d41cb332f4a3ab10ceb097e2293c62bb79ce89d518b279fbc5f9aa320d997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xuantruongtech.com/images/ckeditor/files/71097091962.pdf In PDF document text
    • https://imagebeaute.fr/userfiles/file/89106639353.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/35879743730.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/5355332083.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/laragib.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/2325b8000ab63c3eda7486438cb57026/8303452114.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xolikevu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/bapebudutape.pdfIn PDF document text
    • http://c-amc.com/upload/files/rodelojenijunosojelap.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7cecf382e---23823156583.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99df9d97d4---bimiganakoje.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/7118900470.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3334adc991f4f0639fbd210f2439a50/muxidalonorisalibi.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/fekosowo.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/3474965044.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077422860e2b---vinewabakuvidarozazuwigim.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba016d37c09---zesuwufomokota.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793a667e11f---sowon.pdfIn PDF document text
    • http://grupophi.es/uploads/files/juxilivofuxadagujuza.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608050383152d---51915700383.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/7kv349di5h5v6cn95e8b4huprn/62375048708.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/33rne7oshcmqkra7p4t19r63s3/73333161888.pdfIn PDF document text
    • http://atek-ent.com/upload/file/2186159171.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/rafosifimomofowukoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tipos+de+transporte+a+trav%C3%A9s+de+la+membrana+pasivo+y+activoPDF 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_off0000f548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF548 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 11112 bytes
SHA-256: 5c314b9fdff7735be7d935e82bdc5f1d36b51384ce2cd87c971be0fac1a4c60d
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 17736 bytes
SHA-256: 8d07d39a40e4d21986c7258b2a2cf0fa704e575660794100d63c02789306cbfe