Malicious PDF — malware analysis report

Static analysis result for SHA-256 225ce3ec2ebf804b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 20:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0eb42c5f7e26d1abaa99edf379675c6c SHA-1: 76ca8b74bf390474b747dd90c1a512edfe7e33a7 SHA-256: 225ce3ec2ebf804b75c618bf88a417a3b1fb9cfadb412872952fb9dce45346ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous URLs, many hosted on compromised WordPress sites, likely for phishing or malware distribution. The presence of embedded links and the nature of the heuristics strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=list+and+sell+real+estate PDF link annotation
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/263adc4ba5f15adafcc0851b6f93a588/fenisugimafukuzuga.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160708ef153b8a---52779361090.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/35175086121.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bvnomigvohhkfm0fll75ck19f3/nimijed.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086039e51c92---gadifilote.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/nadifoxatofijulunekodet.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7nplrblmbc4r62kcv5gkoi384p/71345258080.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f465678bb880b7b6f19bab8480b69e8b/32620267197.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c188885342cdf8f9aa7df145bc4c3346/fefipojuwilefepuso.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d35a812b930f418a03487c742336cbce/vanobozaderupigine.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/edkoonkjjbtd3nm6rrsl9bh2d4/jowapokebijugenokibakuze.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd56f345d---43693175004.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sciuv4pvbk4g31kt3jrrr7kfu9/bivuwapibipez.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/16154197666.pdfIn PDF document text
    • https://stopserv.ru/files/file/pezokowabejivojoguv.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090223718a4c---1215759346.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/095a2a272d8815d530671a8d0f09bfbf/kewozatixut.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/cvebuvdt1s6iq4nmafcdd8c5j5/fisimaxomimimakobawor.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/65cee08ebbe8a5360ffc4b5a816e9539/1173257533.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/07b031d4ca30f4d0e87f2c28da1e6728/namafawapun.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5b9fc0723---ruvatop.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/28310676761.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/56727759529.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aeed39825---kiruniwedodifepopikur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c352000d87b---kajuru.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_off0000f1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CF 10080 bytes
SHA-256: 8d5248656b812d4deb8fb7513da08254a248a923dba487fd3b34625efe63df64
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 17120 bytes
SHA-256: 4a88dbbd73594aa4b69893a62700e15831f24d638be26221e7898f691023ad89
font_02_sfnt_off000134f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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