Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efccad066a6797c…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 08:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43bd1513f8435adaf9d3282b660717dd SHA-1: 4e1d95903da45d058c200401af8550fdddf692fe SHA-256: 0efccad066a6797c5f5983be03cc10eaac5f4c69afe3675d65697f706dc7be8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to numerous external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised sites suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lexuspolymers.com/assets/ckfinder/userfiles/files/fulixotesezixamekikuredar.pdf In PDF document text
    • https://graphicart.ro/fckfiles/file/karokivevepaguzofowuwi.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/74912711343.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/94535229355.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/94616535652.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d2b6643be2f082a266d72b1dd4cf423c/20351474906.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/99271284612.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/66849373953.pdfIn PDF document text
    • https://jin-ji.com/upload/files/zomibasupob.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/59079489045.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/bakisura.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401e20502d9---zudativogabodaj.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/tapez.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/denine.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gobexerezilawilisokogarap.pdfIn PDF document text
    • https://matrixx.lu/images/tugorisaxed.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bb9ece76---49482365564.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/67344211475.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/80292162527.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109040123384012.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/93419987142.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/gisivuvukirigunofij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hidden+spy+apps+for+android+freePDF 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_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 17356 bytes
SHA-256: 890e3a6626379c7602e1a694d4163ebd023b15df06edb78788b8aae2d8f61e74
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 10452 bytes
SHA-256: 230696fd2fac975c9a093780cd5aa6cfd7d6fcc16fadefe8812074a8182217d0