Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4523872640384a…

MALICIOUS

PDF

94.1 KB Created: 2021-09-08 15:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f59ef55b4c10980ea090ec28c5f727fd SHA-1: f4905b07deca9dede37a16bb544400d9d2c4f9f2 SHA-256: ff4523872640384a6c928e0fbc3d97f18cb056c3a3a8d5dabe97921d73c3b3f0
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 distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medbillings.us/lightspeedweb1/file/vakofepo.pdf In PDF document text
    • http://elcolono.net/userfiles/files/boxurepojanaxone.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/42171724758.pdfIn PDF document text
    • https://yodobashi-church.com/kuvoki.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da8fc0df1---62262356789.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161348966c9e87---busuveperirumopolalapivo.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/ratudo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/devojagaxexadolewegozad.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gajopujazakesi.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xakoxipixonugises.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210902_4CA182B564AA824E.pdfIn PDF document text
    • http://immopolignano.lu/images/pozetiruwibapukedin.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/risofubilisovubasa.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/lawegerubunapupu.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/84798536943.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sajuni.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/a7bdff584ec0de0426eba6e201c43636/75552296617.pdfIn PDF document text
    • http://sinoorchids.com/image/file/xizoxuwele.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613409a75a6ac---bawagevijubopako.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/kepabowisodesifaraf.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/vakepivumaxe.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/15680541006.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/73668171648.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/21659667525.pdfIn PDF document text
    • http://dmkert.hu/files/file/73788560212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wuthering+heights+character+analysis+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_off000109d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D5 10984 bytes
SHA-256: ec454677e43ae723dd3603332e8d5812f641073040205ead31acdc95617e47a1
font_01_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 18324 bytes
SHA-256: f902c7df7e2469d2106c02e981d53c9403ed9062f3b7b0f2715608f60eacfe9d
font_02_sfnt_off0001521d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1