Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d6394244eb153e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 19:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a82444f8c838a13b482300a7e75cf0b SHA-1: 1b53848ee687188c1ff65a90322f919b6daed7e4 SHA-256: 59d6394244eb153e605b8094241556f52d58538759bcc8b10c67d1ff80180271
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs, including links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to direct users to malicious external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=mod%C3%A8le+r%C3%A8glement+int%C3%A9rieur+entreprise+pdf PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4f57dd1f---84011109391.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zekufatasadorovosenuvaz.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5dm7hkjuonbo4s1tq23usf93p2/71611204674.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/71151210232.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jexawiwolipa.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de4d6191c089c203c4cb743a45b3ae2d/29668208711.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b4948b89ad0---80309955327.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0a1b7198---22598518938.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070332d962e2---93012590318.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/4d51tuha09qlrug7gdc88jihk7/79761332820.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/39793506948.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n5k5nkdek14jttqq41bf5t7826/tuxole.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/56671023207.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8913fa0ea24ecd95dfb15047d5766323/vedobaresivixagakovoturuw.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210723120232411306ggcll.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/kelezedumunobi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/01baa2b89ae31fd0d95b9df3fc3e6819/10672018865.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/munugaz.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/18262755424.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/46113735359.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f2c5f626b15fc5fe2439cd5d72934378/jufogabovijepilejafo.pdfIn PDF document text
    • http://espokebar.com/uploads/files/begixutizevito.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/67a0c3fd89c82ea8c491022e7f2c2029/nutuvano.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_off0000c9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 11080 bytes
SHA-256: 79eb77c3e467a1a8676fa7ba8ddd276560557a1c4614fd3c336fa7b3e8587d23
font_02_sfnt_off0000fac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC0 17580 bytes
SHA-256: a696078656cc3b828eab2ef883a0f7efac2d54cba6ea0790cdba566cb76d2ecd