Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27be9f47993b7e5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4468a08861df1b21b1c20c2afdc584bf SHA-1: b5347630038767da1b5ebf358f38d11cf2a38731 SHA-256: c27be9f47993b7e50f41958947eb7f52ba4808c8f24abd51d759aeaf305e033a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smartech.lv/sites/smartech/uploads/documents/files/sozumukoketenavomusewetiz.pdf In PDF document text
    • http://veivel.com/userfiles/file/kawikinixodapewafuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a30ad0ff8---607623694.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/numav.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/16860451500.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jufuxexudaxivulajix.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/904142441.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/kadupifelo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/56582038187.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/387ddb40d9929300bbdb67f6b2235ebc/97473765645.pdfIn PDF document text
    • https://diphong.com/uploads/fuxawisi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a878a57143c---badirawibabesasu.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/42704649986.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0cb398626a0cb3ba18c879dee678267/70073579687.pdfIn PDF document text
    • http://saptpadi.com/files/file/majanez.pdfIn PDF document text
    • https://papiratisk.cz/soubory/jigofatinupavopiwojaku.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/nadaxumaretatafepovebus.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed1c3d4cb8---76889135883.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/6686963768.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/jamaw.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/34460690856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=download+pdf+reader+for+iphone+5PDF 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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 17824 bytes
SHA-256: c9b723c0068c85778ca014f5eb70c4f0395c0a8bd344887d0254fc9bb8f9ec83
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 10552 bytes
SHA-256: e0a39ee914cdd601b19a6711e899ce9959ae53c4c3c4332432e459d69ab36657