Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0572a848342390b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-21 08:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d6f93cd60963ddea11ff3a198a5b093b SHA-1: f3581fc0aefa2022eb0851e8dca3176fa8b0769f SHA-256: f0572a848342390b121afbe4f0442d2b8db867a3a1e22db7b2c9d2cf83d3d814
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external websites. Several heuristics indicate that these links are part of a link farm, with some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hataylezzeti.com/resimler/files/fejafimixojubar.pdf In PDF document text
    • http://refinerlink.com/userfiles/file/98567253583.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/26043309952.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/seximeto.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121505102564.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/236edeb5a242bde086286659fdcf877f/nunaxop.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/rowovosupebofovu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/zixurawasawubozulizus.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/015878dcb0261129ba4824105b5735ee/tezakagasuguwo.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/nazefizubepozafefasa.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/6994275862.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614036da4677a---27398543335.pdfIn PDF document text
    • https://edarky.net/data/file/83561467776.pdfIn PDF document text
    • http://balone.net/_upload/file///godirejorarizufututon.pdfIn PDF document text
    • http://01host.ru/userfiles/files/5489563094.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03ca9640a---fabupukupotopalozof.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/bivirilo.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/difixaxikujelokavi.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210921101552.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/9213371409.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/sepeko.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/63553240494.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/kokasit.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/rejawalufebijudajamigakob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=quick+charge+apkPDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 15300 bytes
SHA-256: 77a7f6a4fecf3f4cc06d5dd91ac750392bdc4a42dbe2f56240b097882cfb31a9
font_01_sfnt_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 10368 bytes
SHA-256: 5fd824ee8d13ff788d3bcfa9d3df5ea3587158d5b66bc0f1dfb38d69a8603af9
font_02_sfnt_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1