Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c4a72f6a2fcf67…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 02:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6aeae93dfe5c9218b68c49a779e97a9d SHA-1: a90d5dc84c6033b83d5152f68fc7f888002f7a21 SHA-256: 87c4a72f6a2fcf67f78bab84e6e8744ab6fea7bf1743f3068353588eb2ff3dd3
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 CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maria-galland.ru/files/file/28732956231.pdf In PDF document text
    • http://shahgrp.com/uploads/pixos.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/53061538624.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/menefusulozamolomabesoja.pdfIn PDF document text
    • https://norservis.cz/files/files/jitilesabinokilaxefozezix.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/86668037498.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/gutegezutojodeb.pdfIn PDF document text
    • https://polaria.cz/images/file/komobosimobosemite.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/26073097255.pdfIn PDF document text
    • https://badrivishal.com/media/bokis.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dopupusume.pdfIn PDF document text
    • http://greenld.com/userfiles/96231564193.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/9997980317.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/75921571776.pdfIn PDF document text
    • http://vina2002.com/uploads/files/lekidevikivati.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/nolataludetulevov.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/dedojaluwujati.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613335f9499fc---pazepofow.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/60171687146.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614227c32f94b---mifejutuzeselidozuta.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4399a8b2c---89224087.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/70980806668.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133985ca9ab9---54404805922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=super+smash+flash+2+without+flashPDF 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_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 10900 bytes
SHA-256: d4bfd0a7b3427d1fdf1f952de4fc8d1c5bfe128c6de59ceca7113bdd64d0f293
font_01_sfnt_off0000f47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 18120 bytes
SHA-256: 8e6bc44249c774f128ea335a4a86de696ab1269da40c6e93ac6e22235fc8d768

Open this report in the interactive analyzer, or submit your own file for analysis.