Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f2e376cc4e3323…

MALICIOUS

PDF

135.5 KB Created: 2021-09-17 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 383f355bed54df4eb54574a54d75a4a7 SHA-1: 02d4befb4c120ebf78614a9579e55f793cdf1f80 SHA-256: 70f2e376cc4e332390b0482d439e16386dc9fb6236527c9bcf76c77c1b61590a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download and execution of a second-stage payload from one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141a82f8562a---34433110486.pdf In PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161410e2b95d97---27706257369.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/defulonabanepula.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/zoxosalekoxofute.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/7340654327.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/kesegavawozokotubomobizok.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lerumoboxogenimolas.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/katererisaz.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/fozizawunobo.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///81429762827.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/wusexu.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nezow.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/semafalozorekuvuwonajape.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/81445817158.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/xivezazafix.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/maserusebemopazorusomit.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s2j5vc586sidj620lknn5q816f/7618221592.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/14288717900.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/95411268838.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/tokuwamutixe.pdfIn PDF document text
    • http://esistore.be/userfiles/file/25907887657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+downfall+movie+onlinePDF 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_off0001ac74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC74 19996 bytes
SHA-256: 7ce7cf6c61e4b2fe68a6bfaf1e9a74a064b986f0a66e296201efa1cf6e3d8f31
font_01_sfnt_off0001e0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F90F 10368 bytes
SHA-256: efc9344d5fc2ee78a4795e619835443bed33947b1955b156d43cf007fd031cfd

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