Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b0f19072bdd32d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 18:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc3f03a333dca795ee66d6090649c135 SHA-1: 40c760e6aa1751293fc9dffc5f5be499c679b1b3 SHA-256: c1b0f19072bdd32d365e81214822ca5f0d34d29f8151e6e505e8d25c3206f5e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=6th+science+book PDF link annotation
    • http://rogersdesignhouse.com/uploads/files/numozebarojefa.pdfIn PDF document text
    • http://weingut-suppan.at/files/23745976276.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/652f59af4ae9e22af96b546e4f24f2e9/batebeb.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e43ac4fb2a---96978597532.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/80007532794.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/xesijiloluwi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/megikexokupi.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/66239968934.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138215131ad5---21951925259.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/witegovoworapazokewuwa.pdfIn PDF document text
    • http://consade.com/userfiles/file/wedexilepuso.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/mozole.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb8edf59d---dawewubofaselepaku.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/9242709300.pdfIn PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/93849200112.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/rexebomaveradigelo.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/1dnqsscsvbesbctcm76c2jfbj0/wujajulezesajadu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613545b2584fe---14836651311.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/41712687082.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/bovimokaxagafosojoxudoguw.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jodiwaveboxuronabevosipob.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/wedatakejoteje.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_off0000c285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 10320 bytes
SHA-256: 29430a199ffffcc710892bf909de2547e94f5059d8100bd82b9f0ba7fcf6a749
font_01_sfnt_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 20120 bytes
SHA-256: af04d0e2f090cc27f4884787b94aa5162b915d46c17f4fa6a8b9ca64d07f3305

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