Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13e6ad3ea1e5724…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 06:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4abed8822590294014e881212a0b68c SHA-1: 39d6e17b83c1e00e09b128c8b60ccaa46ad088c5 SHA-256: d13e6ad3ea1e5724e369e2d8474487220b5ae323582dde0eb10dad97efff2171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614114d792407---11901013680.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d41b5ee2a7408020d5fc30e1cafec199/kudakuzefa.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/rapopaboxapa.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109190652567386.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tiloso.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/86564790960.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/65883057158.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nivebozomezijanoxunosez.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/9269442185.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/ximerezusapeni.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63325106928.pdfIn PDF document text
    • https://wonkingchina.com/d/files/75704872040.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef33e34d7e---nobebofoxaxavamin.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/kogikujatosa.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/lugulozabetovuru.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/gerutenujotu.pdfIn PDF document text
    • https://orangerun.re/photo/files/2373271683.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/72969005911.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/34887617355.pdfIn PDF document text
    • http://186086.com/upload/files/77677094924.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/kefivajetaxa.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nabiwidebo.pdfIn PDF document text
    • http://travellerisland.com/files/67389971458.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/zavawirewozubetixuj.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pabuwixejafowubivugudawi.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/22259152219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=million+trillion+etcPDF 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_off0000d1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F7 9884 bytes
SHA-256: 4c8d27794291e98243235788255f4d38f90af98f19683d9030e29ff503bb8916
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 18724 bytes
SHA-256: 9cc1db5b5eee7616b2b3a6dcc0270d689ec6c4d912a1543a758fb5b94cf1c4d7
font_02_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1