Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a1f59253dc5e88…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36a574e665864595dd975cd64e639c91 SHA-1: 8d7b9aa4fb980373e13746f0eedc553f10507214 SHA-256: c3a1f59253dc5e882e7bc27050a62b8f9e8a5dcd4d87d22ac906ea531e5d792b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://suamanhinhlcd.net/userfiles/file/mamupatatetijuwolusebuzo.pdf In PDF document text
    • http://playoz.com/ckfinder/userfiles/files/39714748602.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/sanome.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/57970107019.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5bfd9cc2e4d5dd55bc7cd5d996e00dd1/worigokomixago.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/jinatola.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pekisen.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/41620849761.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/bugimosuka.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/nifazarojibolozojuronigap.pdfIn PDF document text
    • https://papiratisk.cz/soubory/59635976003.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/dekobosotafupuzu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c691b5530---diwuwedijixigab.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xikoz.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/veloxelozepokitos.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b6f1450bd83632fbf4f50d4158350bf6/78378450424.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25be42567---80083511311.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/35196510335.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/68928723246.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144fa324285f---1339932132.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140126cacfa5---wegobuwepefalupiwig.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/29245578063.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gshntrov6dmepuv73i7ur2m6i7/savifajefo.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/wininodivukoloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=downloading+your+messages+outlook+androidPDF 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_off0000c02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02A 10984 bytes
SHA-256: f2206bb5e5bdc74dd4157c127cb4daca17d6917096cec3004e86841100c07cda
font_01_sfnt_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 19412 bytes
SHA-256: c86b99a314c9ffdec8ebff3310c5910a38ae651aee281e51970ad91b51fbb704
font_02_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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