Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4239751e276f85d…

MALICIOUS

PDF

145.4 KB Created: 2021-08-01 04:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7859628fce7b4d2b8e8e03bc7b7745bf SHA-1: b058bd9dfce1219d7407fb2fa333d5543d048483 SHA-256: e4239751e276f85defe1c24ba8da80dab7e44be2c94b358c7ed2371e15fcae88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=un+argumento+de+la+obra+de+romeo+y+julieta PDF link annotation
    • https://tipresentoio.it/images/file/17769451737.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8b1401ccb---pisofapopakisomugura.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16088800cc883d---54996535114.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7f082e54349a5f076d62a5388d02d574/zumali.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/juxume.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rurukixoxabodulozesafon.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b6cad27b7---pasobatifukug.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210727235031.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/57502897495.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/34183922772.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/76rqu7589app7gjd0fqfoinbei/46025831137.pdfIn PDF document text
    • http://tyextractor.com/d/files/95555110512.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16086c44276cc9---85080683820.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/wisajewalasogig.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/275b314d036ae11d473fed74ba5505ae/dukuxuwodere.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7d4bd718d---tilonimizoxamesiwizumug.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-30/20210630174551204008.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/59c0d5a82725e0c044dd73d01ae6b929/dusulopazo.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/gezuroja.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/88625893649.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/18720333167.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ead6de1e201df571277518a3392ab58d/33770625764.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/36457952207.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_off0001d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D41F 19804 bytes
SHA-256: e972eb5309dafbd2c2fcbb957f83fd578d98f3b0c668890abaaaaa4502e6e916
font_01_sfnt_off000204e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204E4 10916 bytes
SHA-256: 837a1acec69cc6769d0788eff658e1824c281faba2f936d40a508f8491a883bd
font_02_sfnt_off00021de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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