Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c5d0c46b7c5418…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 16:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6742822d6f23bdf196968da34a76dc9a SHA-1: a18ba18e3402e11a5fbb9bb08941e4b635eb0635 SHA-256: 95c5d0c46b7c5418dc1d4b98610464b53f27dbd1bcd16f86237de48b977e6840
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several heuristics indicating it functions as a link farm. Some links point to compromised WordPress uploads, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://1night2daytour.com/ckupload/files/46223022919.pdf In PDF document text
    • http://aromata.ru/upload/files/83245750774.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371d21b98f5---gafidun.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/ziwexibuje.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/52009157407.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/bee58687bd8013bc81a28d1579cdfab8/taten.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420750b790c---55553313490.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/69308284550.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304051a3bfc---2297550177.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/zawosajuk.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/zoputese.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/wufukodu.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rakaxujeguxixozavobus.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f87d8a5c79dc6c92e0005b7f03badafc/natazuwokofulananupasid.pdfIn PDF document text
    • http://midospa.com/upload/files/50804157569.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/26692720993.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/zijofojugejeke.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/pixebovimivaxufuguxa.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/sugirunagewogifupuzaxagu.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/19835792844.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210914102153.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/90901958294.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/devojagaxexadolewegozad.pdfIn PDF document text
    • http://client.diffuse.info/files/9176271506.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090722033386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+video+enhancer+app+for+androidPDF 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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 17648 bytes
SHA-256: ec8ddb1b8799dff8ffde62ce9c1bdc33539e730a5ca555fbcfb665380a90046a
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 10448 bytes
SHA-256: c2bd270c86da3b8e9ec4ba566a42ebaa8cd469b9f081336feb1a94013ae09b5f

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