Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cf2d20273fa51f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 11:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98eb90cb24d203eea4a7c43ff3d849a4 SHA-1: 19ebba4a0243b693a3f87c07c235b06548d920df SHA-256: c0cf2d20273fa51fe838fc2a0cd37af63d6eb74f72dd54b7aeebbef887e8e00d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage 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. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=crank+palace+read+online+free PDF link annotation
    • http://jinruily.com/UploadFile/file/20210901171023075.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/30695161163.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/58278516980.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/61875601676.pdfIn PDF document text
    • http://ailizia.com/userfiles/82751702547.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/50499741802.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/lewogowokipaxudov.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/29931335141.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/19633336048.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/79780749561.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/63936870753.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/vumekafubupuzazevudakis.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/sigepufivibazekavi.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/wexidonekusiduzotu.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133beb813fc7---xegamexikaru.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/kimebuwunopozox.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aat5h2ur2j23dla11tm6egeht0/jelopejumu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/087c748425831c8681bda7e8e8775016/78999872856.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/sarisefufotezosusijoto.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/vufefuzedepi.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/vevudutoxusenaba.pdfIn PDF document text
    • http://yibetter.com/data/files/fodutanunokulafilikopix.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/65018456670.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/texinosu.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_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 18084 bytes
SHA-256: 3cda9b679b8d0971b1c191966cb5f90ad8270ca726c5039ee8fae2eabf60de03
font_01_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 10468 bytes
SHA-256: addd1410b237e0006a1de69a1602e324d7f2330df331bb550837355829972ba1
font_02_sfnt_off00012f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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