Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fef4f51cc0613d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 00:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee2b51e88d98d8121ed4d8449adebc5d SHA-1: b75f2e9a947884cdc0adc884925a416cbe5db706 SHA-256: 85fef4f51cc0613d4ca2cf6b72d1bf68205f4ed63fe5577c8da6b5891fcd6ec8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript could be used to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 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://cructi.ru/uplcv?utm_term=mp4+dateien+abspielen+android PDF link annotation
    • http://elma-itc.ru/!upload/files/94690399315.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/4563582374.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/tibubosipewazesasevosilul.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/nigeribitadeponikujef.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/xifutizopasaneveta.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/mimenogolipeli.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/saxolejosuvefigudi.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/46113426952.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/68587248486.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/tutepitopepuxiberez.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dagosuwapubedagasata.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/bozenixa.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130594a79b98---vegupemamifibiputoki.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/42779201529.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/79638962201.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132fdbf46e40---7015543401.pdfIn PDF document text
    • https://aneri12.eu/res/file/93655915279.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/mujadazuxizil.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/8447319665.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/pemegefoseguvune.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/54453238590.pdfIn PDF document text
    • https://duvanco.be/docs/files/12310567480.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161304970f2943---69258940690.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedan.pdfIn PDF document text
    • https://stvorki.ru/files/file/lifajuvegikikebo.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/48528492262.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_off0000dd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7E 10596 bytes
SHA-256: 0c7f617f5865ab14a5a573d2f37e0b3d6ac8cad90df143ed72064897f19f079c
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 18408 bytes
SHA-256: c8738afece06159238d34d2133c19392806191ba0fa5f0dc186bf40937f58d26

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