Malicious PDF — malware analysis report

Static analysis result for SHA-256 2308a1ebb1cac5cc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 17:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 104ac575bfba852df15953f94071b492 SHA-1: 2d7cb2a4c91e3bef008e75aa0b78a06b2944d9e6 SHA-256: 2308a1ebb1cac5cc7aaf05858325bf520d461bcd472ef3c100f90864974bdb81
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coyada.com/up_images/up_images/12253668461.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135da416ba96---31208791437.pdfIn PDF document text
    • http://mq-water.net/upload/bozedozazoxuwinisigejomev.pdfIn PDF document text
    • http://dogable.de/userfiles/file/12928027322.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/kelujepejevikutisapezezer.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zumafifelete.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3fa92e34f1c790a82767423ebe95dd82/wobixusojokexow.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/8306080972.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/lipunulonunujomuwojuwegu.pdfIn PDF document text
    • http://446888.top/userfiles/file/14230062001.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/66269205087.pdfIn PDF document text
    • http://hanifeugur.com/image/files/82389866729.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/femutitodaguziwaviw.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/3179739131.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/51554581079.pdfIn PDF document text
    • http://beiks.info/public/file/53344040953.pdfIn PDF document text
    • http://360global.ca/userfiles/file/93213150892.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/65022828417.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/xafukivasi.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904195913.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2e46f42d---xoluvobizirudekafereb.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/fezunegapozikodomezebizuw.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/51599391892.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/ruwerawasatowekular.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/zowesezap.pdfIn PDF document text
    • http://aven.su/userfiles/file/xufukajuzexur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+trap+beat+in+fl+studio+pdfPDF 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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 11068 bytes
SHA-256: f589235b0e428e0398b717544e4a83fef05989267316a35b45a7d9dc5587ad89
font_01_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F6 18744 bytes
SHA-256: e076e637bce39a0ec23a6b0717cffb2e88c6e9cf7b3ff003fa9db97d2b057f45