Malicious PDF — malware analysis report

Static analysis result for SHA-256 65be4fa32b672a63…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1ca1e961c307f8a6165c01df3b44411 SHA-1: d263a5925a98ff5d5b5c44dcfa9251d2206b178e SHA-256: 65be4fa32b672a6341de859f27cf92472977d72bafd58f1dc430462de5beef26
96 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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution pattern. No scripts were extracted, and the document body was heavily obfuscated and truncated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

Heuristics 5

  • 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://fernandopelosini.it/userfiles/files/jovar.pdf In PDF document text
    • https://radio-clipa.ro/userfiles/file/35349280308.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e26263df2---86810634782.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/63861858847.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/tamip.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rijefususijagukeworak.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/30826135218.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/muxasowu.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/woxajomotukinokev.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea645bf05d---mejoxexok.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/mafimajogubixevovin.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/buvovabopozufeme.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/fapetokugirufil.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/58950077934.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/93600255113.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/88285906128.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/gozevewomaposo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/38c9990472437eefc2a3de1eab5b7ec5/40903220841.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/83131730282.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/93016619402.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/65421002071.pdfIn PDF document text
    • http://agrion.org/upload/fichier/81755119217.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/83103508426.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/kubusisipezizabawil.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/06b6c19f43e453dde12155fc12101de0/28872800614.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/4423655615.pdfIn PDF document text
    • http://akademibt.com/resimler/files/21798362885.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=key+features+of+grammar+translation+methodPDF 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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 17480 bytes
SHA-256: 406ec6f2f98d36db9703a4b369e9911a2c496aa2077a0ef89646e16efbb30455
font_02_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 11004 bytes
SHA-256: badd39df9267f1684bc4d8cc9ffbb42ecc845ebf598e2a04f41cfa943d8097b8

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