Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e22fb1ca9666d3…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 18:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9f4ddf29180463297c24240bd9acf054 SHA-1: b6a9877d02238938380effac953617d9e2711677 SHA-256: e8e22fb1ca9666d30c7c1b7babc3a05849f6bff10278410f6a113d90506f103f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=baby+rainbow+trout PDF link annotation
    • https://sydneystudytour.com/accounting/userfiles/file/vexiduwajejakotagede.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210924_232255.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/duligesexelejosetuger.pdfIn PDF document text
    • https://schmitz.cz/res/file/19181549455.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/70394103434.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/vukum.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/23935468654.pdfIn PDF document text
    • https://cooperspick.com/files/27731174101.pdfIn PDF document text
    • http://spharma.ua/files/file/berijuxevoto.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vinogiminasemeno.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/kodeg.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/38717542303.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/januzezujiwufi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f63911a31e---fusirusowojilipoxasomado.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/fososonib.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109071817596404.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/doriso.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/kibesapezuvunatenenapit.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/23979144159.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133f87b58105---nikirixavezewovurezizike.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/81042289844.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/49157128756.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161479aca0b67f---78215893815.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/12689261731.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/24790746834.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/18768818453.pdfIn PDF document text
    • 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_off0000b4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D9 15232 bytes
SHA-256: 24369578000498cc1dd573a9e480241aff138716e39425db303928b0b7cb41f5
font_01_sfnt_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10248 bytes
SHA-256: 17270ed75fb9ce444ef35b51e23212cd64ee7734528a27cf4d962042b21bf2aa
font_02_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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