Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cc225ca4ab16bd…

MALICIOUS

PDF

87.2 KB Created: 2021-08-03 12:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 519352722f6ec95b7eb06eb2d2037c5c SHA-1: 118938742f1523a26f2f068d27903549aeca5d8b SHA-256: 31cc225ca4ab16bdfa4f461c1c69c2fd93fcb7a8f89873db44a14f59a2fb9309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm intended to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://globalcircle.club/userfiles/file/govazataluje.pdf In PDF document text
    • http://mai-colle.jp/userfiles/file/33815169462.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/36815123319.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d220e25c59---61725762274.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2cddql7e0bmsegkio6s1f7a1c1/rojobemafukowotevur.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a2ccb835e23266636debf330d94c078a/pawakaxavugun.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/34q3pcp2o3m9rp7t58bque3sp2/dedukoxerolavolelawejar.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210803101049.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/lekopipupevamiwisir.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072af45b1e69---mowekimelikexibivo.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/nazar.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5b24344db8a8b8d3632e94f4990eae85/61624132024.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a2fe8896---vuxofikojisosojurusupat.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/29318472565.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nijelefovogi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7a902aeb---wifexinuravolasagobuzewo.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8svcq9vq58sfoqkilhoq2439c2/45537157290.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/14735424650.pdfIn PDF document text
    • https://dhesient.com/media/xovigabulogaziponijefuka.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cbced2846d1---53675204883.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a957e717866---kesanobojufakogugo.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d4463644---zeniziwazuguminub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+official+act+prep+guide+2016+2019+answersPDF 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_off0000eaa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA6 11676 bytes
SHA-256: 5259ec598f00fb5768e159ceb8fe1a68141425cfb38de4a0a13f7ff0f5bf95bd
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 17836 bytes
SHA-256: ed253e64e1c58da9c100f18cbbd101431ed599d64e897b7030dd10a4685fba0c
font_02_sfnt_off000134ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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