Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c50d3e097c701f2…

MALICIOUS

PDF

88.9 KB Created: 2021-07-20 18:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e153976242f8f757862588eee37f10e SHA-1: 2f54e84dc5137a13cc133def120662eb00017579 SHA-256: 5c50d3e097c701f27c0f4be7887a795526dd38640dedf7b843e5b8297a88d42c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

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 http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/xonunatederipadotuvo.pdf In PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9dffa561eb2948aabf282b1c1a5b232e/79394256413.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/83386156841.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/3e71fe99416e7fab45461250ec561f79/38918420233.pdfIn PDF document text
    • https://areicon.com/images/file/toxixisa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0eoqmabpv2bcqsmltp70406kcl/72180643157.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sejogudilotexelen.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/83344309626.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/31294768289.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42d831c607---kiroranitafo.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/donewesodela.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/vaxasevetusomu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/8948446988.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2eccdd338---40120467386.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/15394013094.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46633445---jazazeputitefinexegawaros.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/bomagugavo.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/fibawije.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf987c2795b---zizewevig.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082705ec0fa8---sapidib.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c5136b428b5d9aace3d2fc5df8280097/jotezesiwik.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/lafonaw.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/bf44c81ee595b87127d7c677db6019b1/nafuromikit.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/lelevevuvadupadufav.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/20314763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=project+management+roles+and+responsibilities+pdfPDF 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_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 11236 bytes
SHA-256: 849798a8583d5d2668f404e34e07ee2c9de7fd69c87c253e103b8ef489a235bf
font_02_sfnt_off000129a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A5 17012 bytes
SHA-256: d565fe738bbd13b24db4d5ba279fb8c6d89ada16a73f3efba1ae5afd202be53b